Speed Up Windows 10 & 11 — Complete Performance Guide

I timed my own PC last Tuesday morning — 2 minutes 47 seconds from pressing the power button to actually being able to click on Chrome. That’s a machine with a Ryzen 5 5600X in it. Not ancient, not slow. Just… neglected for a few months.

Here’s what bugs me about most “speed up your PC” articles. They give you a checklist, you follow it, and nothing really changes because they’re listing the same generic stuff that doesn’t address what’s actually wrong with your specific machine. So I’m going to do this differently. I pulled numbers from our own repair logs at RebootDoctor — between January and April 2026, we handled roughly 340 slow-PC tickets remotely, and 78% got resolved through software cleanup alone. No new parts, no opening the case. What follows is exactly what we do on those calls, in the order we do it, starting with whatever’s most likely to fix your problem.

Task Manager

Processes

Performance

Startup

97%

CPU

Utilization97%

Speed4.21 GHz

Processes247

Uptime3:14:22:07

Name

CPU

Memory

Disk

OneDrive.exe

38.2%

412 MB

14 MB/s

SearchHost.exe

24.7%

680 MB

8 MB/s

MsMpEng.exe

18.1%

354 MB

22 MB/s

chrome.exe (14)

9.3%

1.8 GB

2 MB/s

System

2.1%

48 MB

0.1 MB/s

The Startup Tab Is Where 90% of People Should Start

Crack open Task Manager (Ctrl + Shift + Esc) and find the Startup apps tab — it’s on the left sidebar in Windows 11, top row of tabs in Windows 10. Sort that list by Startup impact.

Whenever I do this on a client’s machine, the reaction is always the same: “Wait, all of THOSE are running?” Yeah. All of those. And they don’t stop running after boot — Steam sitting in your system tray isn’t just an icon. It’s 80-150MB of RAM occupied, periodic update checks, the whole deal. Stack twelve of those on top of each other and congratulations, Windows is chewing through a full gigabyte of memory before you’ve touched a single app yourself.

My advice? Be ruthless. Genuinely ask: does this absolutely need to launch the second I turn on my computer? For maybe 85% of what’s in that list, the honest answer is nah, not really.

I’ll tell you what I personally disable on every machine I touch: Steam, Epic Games, GOG Galaxy — all the game launchers. Spotify. Discord. Skype. Adobe Creative Cloud (it opens itself when you launch Photoshop anyway, having it sit in memory all day is pointless). OneDrive, and yeah I know that one’s controversial, but it syncs when you open a OneDrive file regardless of whether it’s in your startup or not. Cortana — does anybody actually use Cortana? Every printer manufacturer’s “helper” app. GeForce Experience and AMD Adrenaline.

What do I leave running? Antivirus — though honestly Windows Defender handles that fine by itself these days. Realtek audio drivers. Touchpad driver on laptops so your gestures work. That’s about it.

One client last month had 31 startup items. Thirty-one. Her laptop with a perfectly decent i5-1235U and 16GB of RAM was taking over three minutes to become usable. We disabled 24 of them. Boot-to-usable dropped to 40 seconds. Same hardware, zero dollars spent.

Your C-Drive Is Probably Fuller Than You Think

How full is your C: drive? Go check — File Explorer, right-click C:, Properties. If the blue bar is more than 85% full, that’s your problem or at least a big chunk of it. Microsoft says keep 20% free. From what we’ve seen, the performance cliff starts around 15% free space remaining, and below 10% free you’re in genuine trouble because Windows can’t properly manage its page file anymore. I once had a client’s machine lock up completely during a video call because her C: drive had 800MB of free space left. Eight hundred megabytes on a 256GB drive. She’d been saving everything to the desktop for three years.

Start with Disk Cleanup — type it in the Start menu search, and when it opens, click “Clean up system files” so you get the full version that requires admin access. Tick every box. Two categories in particular tend to be massive: Windows Update Cleanup hoards old update packages “just in case” you need to roll back (spoiler: you almost never do), and on one customer’s Dell Inspiron last March this single category was eating 18GB. Eighteen gigabytes of patches from 2024 just sitting there. The other big one is Previous Windows installations — if you went from Windows 10 to 11, there’s probably a Windows.old folder taking up 15 to 25 gigs that you can safely nuke.

But Disk Cleanup misses a lot.

Your Downloads folder is probably worse than you think. I’m guilty of this myself — every PDF, every installer, every random zip file just accumulates in there. Right-click it, hit Properties, and brace yourself. On my work laptop it was 14GB last time I checked, and I had stuff from 2023 in there.

Then there’s your browser cache. I cleared Chrome’s cache on my own machine while writing this — 3.2GB. Three gigs of cached images and scripts from websites I visited once six months ago. Go to Chrome Settings, Privacy, Clear browsing data, check “Cached images and files.” Firefox stores its cache in a similar spot.

One more spot nobody thinks about: hit Win+R, type %temp%, press Enter. Select everything in that folder and delete it. Some files will say they’re in use — just skip those. The rest is garbage. I got back 2GB from this folder alone last week, and I clean it relatively often.

After all that cleanup, do yourself a favor and flip on Storage Sense (Settings → System → Storage → Storage Sense) so Windows does basic cleanup automatically on a monthly basis. It’s not perfect — doesn’t touch your Downloads folder or browser cache — but it handles temp files and Recycle Bin stuff without you having to think about it.

The SSD Question

If your computer still has a traditional spinning hard drive — and you’d know because it makes a soft clicking or whirring sound — this is the single most impactful upgrade you can make. Bar none. Nothing else comes close.

Crucial ran benchmarks showing SSDs boot 400-800% faster than mechanical drives, and honestly that tracks with what we see every week. Last one I personally timed: a client’s HP Pavilion went from 3 minutes 20 seconds to boot (the old Seagate Barracuda was dying, you could hear it clicking) to 28 seconds flat on a $38 Kingston A400. Twenty-eight seconds. For thirty-eight dollars.

Here’s roughly what changes in your daily experience. Boot times: a spinning drive typically takes 2-4 minutes to get to a usable desktop. Even a cheap SATA SSD cuts that to 20-35 seconds. An NVMe drive in an M.2 slot? I timed one at 12 seconds flat on a clean Windows install. Opening Chrome goes from “click… wait… wait… oh come on… there it is” (8-15 seconds on a hard drive) to basically instant on NVMe. File operations are the other big one — copying a 10GB folder from one location to another takes 5-8 minutes on a hard drive, under a minute on NVMe.

Pricing has gotten absurd. A decent 1TB NVMe — Samsung 980, WD Blue SN580, that tier — sits around $55-75 in May 2026. Three years ago that same drive was $120. SATA SSDs like the Samsung 870 EVO are even cheaper, $35-40 for 500GB, though fewer new machines have SATA slots these days.

The part where people get tripped up isn’t the drive itself, it’s getting their stuff over to it. You can clone the old drive using Macrium Reflect — free version works fine. Problem is, cloning copies everything, including all the junk slowing you down in the first place. I’d say about 60% of the time we end up recommending a clean Windows install on the new SSD instead of a clone. More work upfront, but the result is dramatically better.

If you’re not comfortable opening your laptop or desktop to swap drives, that’s a totally reasonable reason to ask for professional help. We do remote-guided SSD installs — you handle the physical swap while we walk you through the cloning or fresh install over screen share. Takes about 45 minutes.

Background Stuff That Eats Resources Quietly

Okay, back to Task Manager — you’ve still got it open, right? Hit the Processes tab. Click the CPU header so the highest usage processes float to the top. Now click Memory and do the same thing. You’re looking for the stuff you don’t recognize that’s eating 3-4% CPU or several hundred megs of RAM. Nine times out of ten there’s at least one thing in there that makes you go “what the hell is that?”

The usual suspects, in the order we encounter them most often:

Windows Search Indexer shows up as SearchIndexer.exe and it rebuilds its search database in the background on some schedule that Microsoft apparently determined by throwing darts at a wall. When it decides to index, it absolutely hammers the disk. On a mechanical hard drive this is almost unfixable — the PC basically locks up for ten or twenty minutes while it crawls through your files. You can kill it entirely (services.msc, find Windows Search, set to Disabled) but then Start menu search gets noticeably slower. My take: if you’re on an SSD, leave it. The impact is barely perceptible on solid state storage. Still on a spinning drive? Disable it and just use File Explorer’s search bar instead — it’s not as fast but at least your computer won’t freeze every Tuesday at 2pm.

SysMain — Microsoft renamed this from Superfetch a while back, but the idea is the same: it watches which programs you open most often and preloads them into RAM so they launch quicker. Clever in theory. In practice, on machines with 8GB or less, it’s counterproductive because it fills up your already-scarce memory with predictions that aren’t always right. Try killing it via services.msc → SysMain → Stop → Disabled and see if things improve. Got 16GB or more? Leave it alone, the tradeoff tips in its favor at that point.

And then there’s Windows Update, which — okay, deep breath. I have complicated feelings about Windows Update. On one hand, yes, security patches are important, you should install them, blah blah blah. On the other hand, Microsoft’s decision to download and install multi-gigabyte cumulative updates in the background while you’re trying to work is genuinely one of the worst UX decisions in modern computing. Your disk usage spikes to 100%, your CPU gets hijacked, and this can last anywhere from twenty minutes to over an hour depending on how far behind you are on updates.

Guy called us in April. Brand new ASUS laptop, bought it three days prior. “It’s defective,” he says. “Everything freezes.” I connected to his screen and Task Manager was showing Windows Update Service Host at 95% disk usage. It was downloading the May cumulative patch. I told him to just… wait. Go get lunch. Come back in an hour. He did. Laptop was perfect after that. Three days of thinking his brand new computer was broken and the fix was literally “wait for the update to finish.”

You can at least tell Windows when NOT to bother you: Settings → Windows Update → Advanced options → Active hours. Set your work hours and it’ll try to do its thing outside of that window.

Norton. McAfee. Avast. If any of these are running on your machine, there’s a non-trivial chance they’re the reason your PC feels slow. I know this is a controversial take but AV-TEST Institute has been giving Windows Defender near-perfect scores for years now and in my experience as someone who touches dozens of PCs every month, Defender is genuinely sufficient for the vast majority of people. Norton in particular is an absolute resource hog — I’ve seen it use 400-600MB of RAM just sitting there doing nothing. Uninstall it. If you ever need to scan for something specific, grab Malwarebytes free, run it once, done. No always-on background monitoring eating your resources 24/7.

Visual Effects and Animations

I’m going to be honest with you: I think this particular tip is massively overhyped. You see it in every single “make Windows faster” article ever written, usually near the top like it’s some kind of game-changer. It isn’t. On anything made in the last five or six years, turning off window animations saves you maybe a third of a second per window open. If that.

Here’s where I’d draw the line. Computer from 2018 or earlier? Only 4GB of RAM? Yeah, go ahead, kill the animations. Open Run with Win + R, type sysdm.cpl, Advanced tab, Performance Settings, choose “Adjust for best performance.” Fair warning though — Windows looks genuinely terrible with all effects disabled. I mean really ugly. Like early-2000s ugly. Fonts render weird, shadows disappear, everything feels flat and cheap.

What I actually recommend instead of the nuclear “disable everything” option: go Custom and just turn off the animate-minimize, animate-taskbar, and fade-menus options. Leave the font smoothing on. Seriously, leave ClearType enabled. Without smooth font edges the text on your screen looks like it was rendered by a GameBoy Advance and you will hate it.

The Stuff Nobody Tells You About Power Plans

I had a customer in March, a graphic designer, complaining her laptop — a fairly new ThinkPad with an i7 and 16GB — felt “mushy” whenever she was working at her desk. Ran fine at coffee shops, weirdly. Turned out her power plan was set to “Balanced” and she always had it plugged in at her desk. The CPU was being throttled to save battery power on a machine that was literally connected to wall power. Switched her to “Best performance” (it’s under Settings → System → Power & battery → Power mode) and the “mushiness” vanished.

This is a surprisingly common one with laptops. HP and Dell actually ship some of their desktop PCs with power-saving modes too, which makes absolutely no sense for a machine that’s never going to run on battery, but here we are. Check yours — the old-school path through Control Panel → Power Options → High Performance gives you more granular control if you want it, though you sometimes need to click “Show additional plans” because Microsoft hides it.

Random Windows 11 annoyance while we’re on the topic: “Modern Standby” (Microsoft calls it S0 Low Power Idle internally) makes some machines feel slow for a solid minute after waking from sleep. It’s not really a performance problem so much as a poorly-implemented power management feature that makes your first minute of use feel sluggish. I could go down a rabbit hole on the registry tweaks for this but it’d triple the length of this section, so I’ll save that for another time.

Drivers Actually Matter (Sometimes)

This is one of those topics where the advice online ranges from “update every driver immediately” to “never touch your drivers.” Both are wrong. Most drivers are fine left to Windows Update. There are exactly two categories where I’ll actually go out of my way to manually update:

First, graphics. If you’ve got a dedicated NVIDIA or AMD GPU, do NOT rely on Windows Update for your GPU driver. Microsoft ships a generic version that’s usually months behind and sometimes actively performs worse than what NVIDIA or AMD provides directly. I watched the most bizarre Chrome scrolling stutter on a client’s Acer Nitro last month — page would jitter and tear when scrolling Reddit. Turns out his NVIDIA driver was from November 2025, pushed by Windows Update. Downloaded the May 2026 driver from nvidia.com, installed it, the stutter was completely gone. You wouldn’t think of Chrome scrolling as a “graphics” issue but the GPU does all the window compositing behind the scenes.

Second exception: NVMe storage controller drivers. If you bought a Samsung 980 Pro and your sequential reads are showing 1,800 MB/s instead of the 7,000 MB/s on the box, you’re probably running Microsoft’s generic NVMe driver instead of Samsung’s optimized one. Grab CrystalDiskMark (free), benchmark your drive, compare to the manufacturer’s specs. Big discrepancy? Driver issue almost guaranteed.

Everything else — network adapters, audio, USB controllers — leave it alone. I wasted half a day in 2024 trying to manually update every driver on a client’s Gigabyte board and the only tangible result was breaking his headphone jack for two hours until I rolled back the Realtek driver. Lesson learned.

Corrupted System Files — Worth Checking, Easy to Fix

Windows actually ships with a pretty solid self-repair tool that nobody seems to know about, which is a shame because it fixes some of the most mysterious slowdowns we encounter. Corrupted system files — usually caused by a janky update, a power outage mid-install, or just entropy over time — create this frustrating situation where nothing is obviously broken but everything feels wrong. File Explorer hangs for two seconds before responding. Programs launch slowly on the first try but fine on the second. Weird stuff.

Right-click the Start button, pick “Terminal (Admin)” or “Command Prompt (Admin)”, and type:

sfc /scannow

Go make coffee or something, it takes about ten to fifteen minutes. SFC compares every protected system file against Microsoft’s known-good copies and replaces anything that doesn’t match. Had a client in February whose laptop was taking 12 seconds to open Settings — twelve seconds for a built-in Windows app. SFC found and replaced three corrupted DLLs and the problem went away completely.

If SFC spits out a message about finding corrupt files it “couldn’t repair,” the backup cache that SFC uses is itself corrupted. Not ideal but not catastrophic — run this:

DISM /Online /Cleanup-Image /RestoreHealth

That forces Windows to download fresh copies of everything from Microsoft’s update servers and rebuild its repair cache. Takes 15-25 minutes, needs an internet connection. After DISM finishes, run sfc /scannow one more time to actually apply the fixes.

In our experience maybe one out of every seven or eight slow PCs we touch has underlying file corruption contributing to the problem. Not always the only cause, but often a contributing factor that makes everything else worse. Worth running even if you think something else is the main issue. And if the corruption is severe enough, you might eventually start seeing blue screen errors — at which point you’ve got a bigger problem than slowness.

When RAM Is Actually the Problem (and When It Isn’t)

“I think I need more RAM” is probably the single most common thing customers tell us before we’ve even looked at their machine. And look — sometimes they’re right. But more often the RAM is fine and something else is the actual bottleneck.

Before you spend money, go look. Task Manager, Performance tab, Memory. Two numbers matter:

First: the percentage while you’re actually working. Not idle — your real Tuesday afternoon workload. Browser open with whatever ungodly number of tabs you normally have, email running, maybe Spotify in the background, the works. North of 80% consistently? Yeah, you need more. South of 70%? Don’t waste your money, something else is causing the slowdown.

Second: look at the “Committed” vs “Installed” numbers. Committed is how much Windows has promised to programs, Installed is what you physically have. When committed exceeds installed, Windows is frantically shuttling data to and from your hard drive to compensate. That’s your problem right there — the page file thrashing is what makes everything feel like molasses.

Quick sanity check on what different amounts of RAM can realistically handle in 2026: 4GB is basically unusable for anything beyond reading one article in one tab. I’m not exaggerating — Windows 11 itself uses about 3GB. Eight gigs gets you through light browsing and Office but Chrome with a dozen tabs will push it. Sixteen is the sweet spot for most humans. Thirty-two is overkill unless you do video work or run virtual machines — and if you’re doing those things you already know you need 32GB, you don’t need me to tell you.

And yeah, we need to talk about Chrome. Open Chrome’s own Task Manager — hit Shift + Esc while Chrome is focused — and prepare to be horrified. A single Gmail tab can eat 200-350MB. Facebook’s even worse. I just checked my own right now: 23 tabs, 4.1GB total. Almost a quarter of my RAM devoted exclusively to browser tabs. If you’re the kind of person who has 30+ tabs open (no judgment, I get it), you might genuinely need 16GB of RAM just to comfortably browse the web in 2026. That’s the reality of modern web apps.

Overheating Throttles Everything

Okay so this is the one that makes me want to throw things. You’ve tried everything. Task Manager looks fine. CPU usage is at like 15%. Memory is fine. Disk isn’t maxed out. Yet the computer. Is. Slow.

Check the temperature.

Your CPU has a thermal limit — usually 95 to 100°C for Intel chips, around 95°C for AMD. When it gets close to that ceiling, it doesn’t crash or shut down (usually). It just… slows itself down. Deliberately. Running at maybe 60% of its rated speed to generate less heat. And nothing in Task Manager will tell you this is happening because the CPU is voluntarily throttling itself. The utilization percentage looks normal. It’s just that “100%” now means half of what it should mean.

Grab HWiNFO — free, sensors-only mode is what you want. Look at your CPU temperature while doing whatever makes your PC feel slow. Under 70 degrees? You’re fine, temperature isn’t the issue. But if you’re sitting at 85-90°C while doing nothing more demanding than browsing the web? Something is wrong with your cooling.

Laptops: it’s dust. I would bet actual money. Pop off the bottom panel (YouTube your model + “fan cleaning” for a video guide) and blow out the fan and heatsink with compressed air. We wrote a whole guide on laptop overheating because this comes up so often. Desktops: make sure your fans are spinning. I’ve seen fans just… stop. Dead bearing, unplugged cable, whatever. CPU cooler clogged with a felt blanket of dust. Easy fix but you have to actually open the case and look.

The Nuclear Option: Fresh Windows Install

I hate recommending this because it’s a pain in the ass, but sometimes it’s genuinely the right answer. If you’ve tried everything above and your PC still drags — and I mean you’ve actually tried each thing, not just skimmed the headers — a fresh Windows install is basically hitting the reset button on three years of accumulated garbage. Registry entries from programs you uninstalled in 2023. Driver fragments from peripherals you plugged in once. Service entries for software that no longer exists. All of it, gone.

The process itself is surprisingly quick if you have a USB drive handy. Download Microsoft’s Media Creation Tool, create a bootable USB, boot from it, choose Custom, format the drive, done. Twenty minutes on an SSD, maybe forty-five on a hard drive. What takes the rest of the afternoon is reinstalling your programs and reconfiguring everything the way you like it. Back up your Documents folder and your Desktop to an external drive first — don’t skip this step, seriously, I’ve seen tears. Chrome bookmarks sync to your Google account automatically so those are fine, but check for anything else you’d miss.

We tell customers this is the “moving to a new apartment” approach. It works almost every time, but it’s not where you start — it’s where you end up when nothing else fixes it.

Malware You Don’t Know About

Not every slow computer is an optimization problem. Sometimes something is actively sabotaging you.

Cryptominers are the big one we run into these days. Some sketchy installer or browser extension drops a mining process on your machine and suddenly your CPU is pegged at 90-100% doing cryptocurrency math for some random person in Eastern Europe. Your fans go nuts, everything crawls, and if you look at Task Manager there’ll be a process with a name like svchost_update.exe or something that sounds vaguely legitimate but definitely isn’t. We pulled a miner off a client’s gaming rig in February that had been running for four months. He thought his RTX 4070 was defective. It wasn’t — something was stealing 40% of his CPU constantly.

Browser hijackers are the other flavor of this. Toolbars you didn’t install, your search engine magically changed to something called “SearchTurbo” or whatever, pop-ups for cleaning software that is itself malware. Classic stuff.

Malwarebytes catches things that Defender occasionally misses, especially adware and “potentially unwanted programs” that exist in the gray zone between legitimate software and outright malware. Free version is fine — install it, run a full scan, see what comes up. Our malware removal guide covers the deeper cleanup if Malwarebytes finds something nasty.

What If None of This Worked?

If you’ve genuinely worked through everything in this article — and I mean actually done it, not just read it — your PC should feel noticeably better. If it doesn’t, at this point the issue is probably something you can’t easily diagnose without specialized tools.

A hard drive that’s starting to fail creates this frustrating pattern of intermittent slowdowns weeks or months before it dies completely. Bad RAM shows up as random freezes mixed in with general sluggishness. One of the weirder ones we’ve encountered: a swollen battery inside a laptop physically pressing against the motherboard and causing thermal throttling. Client thought his three-year-old Lenovo was just “getting old.” Opened it up and the battery was literally bulging.

We charge $9.90 for a remote diagnostic. That gets you a screen-share session where we poke through Event Viewer logs, run hardware diagnostics you probably don’t have installed, check S.M.A.R.T. data on your drive, and tell you specifically what’s going on. If it’s a software fix we can handle remotely — corrupted driver, misconfigured service, whatever — we fix it right there. If it’s hardware that needs a physical repair, we tell you that instead of pretending we can solve it through a screen share.

I realize that last paragraph sounds like a sales pitch, and I guess it is, but the honest-to-god reason I wrote this article is that about 78% of people who reach out to us with slow PCs could have fixed it themselves with the stuff above. Twenty-two percent genuinely need professional help. If this guide gets you into the 78%, we’ve done our job — even if you never call us.

Last verified: May 2026