To speed up a Windows PC, restart it, install updates, disable unnecessary startup apps, free up disk space, and run a malware scan before considering a RAM or SSD upgrade.
Most Windows slowdowns are caused by software, not worn-out hardware, which means you can usually fix them for free. Work through the steps below in order, from the quickest wins to the deeper fixes. The instructions apply to Windows 11, with notes where Windows 10 differs.
Start with a restart and updates
Before changing any settings, restart the computer and let Windows finish any pending updates. A restart clears stuck processes and frees memory, and updates often include performance and driver fixes.
- Open Start > Power > Restart (Restart is more thorough than Shut Down because of Fast Startup).
- Go to Settings > Windows Update and click Check for updates.
- Install everything offered, including optional driver updates, then restart again if prompted.
See what is using your resources
Before you start disabling things, it helps to know what is actually slowing the machine down. Press Ctrl+Shift+Esc to open Task Manager and look at the Processes tab. The CPU, Memory, and Disk columns show which apps are working hardest; click a column header to sort by it. If a single program is pegging the CPU at high percentages while you are not using it, or the Disk column sits at 100 percent for long stretches, you have found a likely culprit. Right-click a runaway process you recognize and choose End task, but never end system processes you do not understand.
Trim what starts automatically
Programs that launch at login are one of the most common causes of a slow boot and a sluggish desktop. Review them in Task Manager.
- In Task Manager, click the Startup apps tab (in Windows 10 it is simply Startup).
- Look at the Startup impact column and right-click anything rated High that you do not need immediately, then choose Disable.
- Sign out and back in to feel the difference.
Disabling a startup entry does not uninstall the app; it just stops it launching on its own. Leave your antivirus and anything published by Microsoft or your PC maker enabled unless you are certain.
Free up disk space
A nearly full drive slows Windows down because it has no room for temporary files and virtual memory. Aim to keep about 10 to 15 percent of the drive free.
- Go to Settings > System > Storage and turn on Storage Sense to clear temporary files automatically.
- Click Temporary files to remove caches, the Recycle Bin, and old update files right away.
- For a deeper clean, search the Start menu for Disk Cleanup and run it, including Clean up system files.
- Uninstall apps you no longer use under Settings > Apps > Installed apps.
The same clutter problem happens on phones, and the cleanup logic is similar; if you juggle several devices, our guides on how to free up space on iPhone and how to check iPhone storage use the same idea of clearing caches and unused apps first.
Scan for malware
If the slowdown came on suddenly, or the PC runs hot with the fan spinning while idle, scan for malware. Windows has this built in.
- Open Windows Security from the Start menu.
- Choose Virus & threat protection.
- Click Scan options, select Full scan, and start it.
Let the scan finish and remove anything it flags. Keeping real-time protection on prevents most infections in the first place.
Adjust performance settings
Windows animations look nice but cost a little performance on weaker machines. You can prioritize speed instead.
- Search for Adjust the appearance and performance of Windows.
- Select Adjust for best performance, or manually turn off shadows and animations.
- Under Settings > System > Power, set the power mode to Best performance when plugged in.
Tame the web browser
For many people the browser, not Windows itself, is the real source of daily sluggishness. Each open tab uses memory, and a page left open for hours can quietly balloon its usage, so closing tabs you are not using is the single easiest fix. Extensions add up too: open your browser’s extensions page and remove anything you no longer use, since each one runs in the background. A bloated browser cache can occasionally cause slow or broken pages rather than fast ones, so clearing it is worth trying when a specific site drags. Keeping the browser itself updated to its latest version also brings speed and security improvements that older builds lack.
When to upgrade hardware
If software fixes are not enough, two upgrades give the biggest returns on older PCs. The table below compares typical impact.
| Upgrade | Main benefit | Best for |
|---|---|---|
| Hard drive to SSD | Much faster boot and app loading | Any PC still using a mechanical hard drive |
| More RAM | Smoother multitasking and many tabs | PCs with 4-8 GB that run out of memory |
| Fresh Windows install | Removes accumulated clutter | Machines slow after years of use |
Check current memory use in Task Manager under the Performance tab: if Memory sits near 100 percent during normal work, more RAM will help. If the Disk figure spikes to 100 percent on a mechanical drive, an SSD is the answer.
A sensible maintenance routine
Keeping a PC fast is mostly about small habits: install updates promptly, restart at least weekly, keep the drive from filling up, and review startup apps whenever you install new software. Overheating also throttles performance, so make sure vents are not blocked and the screen and chassis are clean; our guide to how to clean a laptop screen covers safe cleaning without damaging the display. If browsing in particular feels slow, the problem may be your connection or too many open tabs rather than the PC, and it is worth learning what a VPN is and whether one might be adding overhead to your traffic. With these steps, most machines regain a noticeable amount of their original speed without spending anything.
