Windows PC Running Slow? 10 Fixes You Should Try First

A Windows PC running slow is one of the most common tech complaints there is, and also one of the most misdiagnosed. People assume their computer is simply old or broken, when the real cause is usually something fixable: too many startup apps, a cluttered drive, or an outdated driver quietly dragging everything down.

Here are 10 fixes to work through, in order, before you spend money on anything. Most take five minutes or less.

1. Diagnose the Problem First With Task Manager

Before fixing anything, find out what's actually slow. Press Ctrl+Shift+Esc to open Task Manager, then click the Performance tab. Watch CPU, memory, and disk usage for about a minute while your PC sits idle.

High CPU usage at idle usually points to a runaway background process. Memory usage consistently above 85 to 90 percent means you're likely short on RAM for how you use the machine. Disk usage that spikes to 100 percent during ordinary tasks, especially on an older hard drive, points to storage speed as your bottleneck. This five-minute check tells you which of the fixes below to prioritize.

2. Disable Unnecessary Startup Apps

If your Windows 11 slow startup is the main complaint, this is usually the fix. In Task Manager, open the Startup Apps tab and check the "Startup impact" column. Disable anything marked High that you don't need the instant you log in, like chat apps or cloud sync tools. Fewer programs competing for resources at boot means a faster, smoother startup every time.

3. Close Background Processes You Don't Need

Startup apps are only part of the story. Plenty of software keeps running quietly in the background long after you've stopped actively using it. In Task Manager's Processes tab, sort by CPU or Memory and look for anything unfamiliar or unnecessary consuming resources right now. Right-click to End Task on anything you don't need, but be careful with anything under Windows Processes, since ending a core system process can cause instability.

4. Uninstall Software You No Longer Use

Old, unused programs don't just take up storage space. Many keep background services or scheduled tasks running even when you never open them. Go to Settings > Apps > Installed apps, sort by size or install date, and remove anything you genuinely don't need anymore. This is a quick way to reclaim both storage and a bit of background performance at the same time.

5. Clear Temporary Files With Storage Sense

Temporary files, cached data, and leftover update files build up over time and can slow things down, particularly once your drive starts running low on free space. Turn on Storage Sense under Settings > System > Storage, and set it to automatically clean temporary files on a schedule. For an immediate cleanup, go to Settings > System > Storage > Temporary files, review what's listed, and delete what you don't need.

6. Run a Full Malware Scan

If your PC slowed down suddenly rather than gradually, move this fix near the top of your list. Malware and unwanted background software are a common cause of a sharp, unexplained slowdown. Open Windows Security, go to Virus & threat protection, and run a full scan rather than a quick scan, since a quick scan only checks the most commonly infected locations. It costs nothing and takes only a few minutes to rule in or out.

7. Install Pending Windows Updates and Driver Updates

An outdated system can genuinely cause performance issues, including poor hardware compatibility and unpatched bugs. Check Settings > Windows Update and install anything pending. Then check Device Manager, or your PC manufacturer's own support tool, for outdated graphics and chipset drivers specifically. Driver issues are a frequently overlooked cause of stuttering, and updating them is free.

8. Turn Off Visual Effects You Don't Need

Windows 11's animations and transparency effects look good, but they use real system resources, especially on older or lower-powered hardware. Search "Adjust the appearance and performance of Windows" in the Start menu and choose "Adjust for best performance" to disable most effects at once, or pick and choose manually. This matters more on aging hardware, but it's a free, instant change worth making either way.

9. Set Your Power Mode to Best Performance

Windows 11 can throttle performance to conserve energy, which makes sense on battery but works against you when you're trying to fix a slow desktop or a plugged-in laptop. Go to Settings > System > Power & battery > Power mode and switch to Best Performance. Just remember to switch it back if you're unplugged for a while, since it will noticeably reduce battery life.

10. Upgrade Your RAM or Switch to an SSD

If you've worked through fixes one through nine and your PC is still struggling, particularly with consistently high memory or disk usage, a targeted hardware upgrade is the next step, and it's usually far cheaper than a new PC.

SSD vs. HDD: The Upgrade With the Biggest Impact

If you're still running a traditional hard drive, switching to a solid-state drive is typically the single most noticeable upgrade available. An SSD has no moving parts, which means dramatically faster read and write speeds. Boot times that take two minutes on an HDD can drop to around fifteen seconds on an SSD. If disk usage regularly hits 100 percent in Task Manager during normal use, this is very likely your real bottleneck.

How Much RAM Do You Actually Need?

If memory usage is what's consistently maxed out instead, more RAM is the more relevant upgrade. For typical Windows 11 use in 2026, including browsing with many tabs open and light multitasking, 16GB is a reasonable baseline, with 8GB increasingly feeling tight. Heavier multitaskers and anyone doing video editing or running several demanding apps at once will get more value from 32GB.

A Timing Note on RAM Prices Right Now

Before you buy, it's worth knowing that 2026 has been an unusually expensive year for RAM specifically, due to a global memory shortage. Manufacturers have shifted significant production capacity toward AI data center memory, squeezing consumer DRAM supply. Industry tracker TrendForce reported DRAM contract prices rising 90 to 95 percent quarter-over-quarter in early 2026, and market reporting describes a 32GB DDR5 kit that cost roughly $90 to $120 in mid-2025 selling for $350 to $420 by early 2026, more than triple in under a year. SSD prices have risen too, though less sharply than RAM. Given this, it's worth exhausting the free fixes above first, and comparing prices across a few retailers if you do decide an upgrade is necessary. If your bottleneck is disk speed rather than memory, an SSD upgrade is likely the better value until RAM prices come back down.

The Bottom Line

Most slow Windows 11 PCs aren't failing hardware, they're just carrying years of accumulated startup apps, background clutter, and outdated drivers. Work through these 10 fixes in order, and you'll resolve the overwhelming majority of everyday slowdowns without spending a cent. If Task Manager still shows consistently maxed-out memory or disk usage after all that, a focused SSD or RAM upgrade will usually get you more noticeable speed per dollar than replacing the whole machine.