How to Speed Up Your Computer: 14 Free Fixes That Work (2026)

# How to Speed Up Your Computer: 14 Free Fixes That Work (2026)

By Daniel Rozin | A Versus B | October 9, 2026

A slow computer is rarely a hardware problem. In the vast majority of cases — across both Windows and Mac — the culprit is software: too many startup programs, a bloated browser, a full drive, outdated drivers, or a background process gone rogue. This guide covers 14 free fixes that genuinely work, ordered from quickest to most involved. Most of them take under 5 minutes.

1. Restart Your Computer First#

This sounds obvious, but it's also the most consistently effective fix. Many computers run for days or weeks without a restart, accumulating open applications, memory leaks, and pending updates that create performance drag. Restart (not shut down and power on — use Restart specifically to clear the memory correctly) and test performance before any other steps.

2. Disable Startup Programs#

The most common cause of slow startup times and sluggish performance on a fresh boot is too many programs launching at startup. Every piece of software you've ever installed that adds itself to startup (Spotify, Slack, OneDrive, Teams, Zoom, browser extensions, and dozens of others) steals CPU and RAM the moment you power on.

Windows 10/11: Open Task Manager (Ctrl+Shift+Esc) → Startup tab → right-click anything you don't need at boot → Disable. Look for programs with "High" impact.

Mac: System Settings → General → Login Items — remove anything you don't need on boot.

Disabling startup programs does not uninstall them — they still run when you open them manually.

3. Check for Malware#

Malware — including adware, cryptominers, and spyware — is among the most aggressive causes of slow performance. Cryptominers in particular run your CPU at 100% continuously to mine cryptocurrency using your hardware.

Run a free scan with Malwarebytes (free tier covers on-demand scanning) before concluding your computer needs a hardware upgrade. A single piece of adware can reduce performance by 50% or more.

4. Free Up Disk Space#

Both Windows and Mac slow down significantly when the system drive has less than 10–15% free space. The operating system uses free disk space as virtual memory and for system processes — when it runs out, everything crawls.

Windows: Open Settings → System → Storage → Storage Sense. Enable it to automatically remove temporary files. Also run Disk Cleanup (search for it in Start) and check "Windows Update Cleanup."

Mac: Go to About This Mac → Storage → Manage. Look for "Purgeable" space, move large files to iCloud or an external drive, and empty the Trash and Downloads folder.

The biggest quick wins are usually: emptying the Downloads folder, clearing the browser cache, and removing large video files you no longer need.

5. Clear Your Browser Cache#

Modern browsers accumulate gigabytes of cached data — which ironically slows the browser down rather than speeding it up when the cache grows very large.

Chrome: Settings → Privacy and security → Clear browsing data → set time range to "All time" → check "Cached images and files" → Clear data.

Safari: Develop → Empty Caches (enable Develop menu in Settings → Advanced first).

Do this once a month if you notice browsing feeling sluggish. The Chrome vs. Edge comparison is also worth reading — Edge has consistently lower RAM usage than Chrome in 2026, which matters on machines with 8GB or less.

6. Close Unused Browser Tabs#

Browser tabs are memory-hungry. Each open tab in Chrome or Edge consumes 50–300MB of RAM. Having 30 tabs open is the equivalent of running 30 mini-applications simultaneously. If you're on 8GB RAM (still common), a heavy browser session alone can consume 4–6GB, leaving the rest of the system starved for resources.

Use a tab manager extension (Tab Wrangler, OneTab) to automatically suspend or collapse tabs you haven't used recently.

7. Update Windows (or macOS)#

Pending updates — particularly Windows Updates — can run in the background and cause massive slowdowns. Check for and install any pending updates, then restart.

Windows 11: Settings → Windows Update → Check for updates.

Mac: System Settings → General → Software Update.

After major updates install, give the system 15–20 minutes on the first boot — it runs background optimization jobs that temporarily slow things down but permanently improve performance.

8. Adjust Your Visual Effects Settings#

Windows 11 runs dozens of visual effects (animations, transparency, shadow effects) that consume CPU and GPU resources. On lower-end hardware, disabling them noticeably improves responsiveness.

Search "Adjust the appearance and performance of Windows" in the Start menu → Select "Adjust for best performance" (turns off all effects) or manually uncheck the most expensive ones (transparency effects, animated controls, fade effects for menus).

9. Check for Background Processes Eating Resources#

Open Task Manager → Processes tab → sort by CPU or Memory. Look for any process above 10–15% CPU or 500MB+ RAM that you don't recognize or don't actively need.

Common hidden CPU eaters:

• Windows Update service: runs intensively during downloads — it self-resolves
• Antivirus full scan: schedule these for overnight, not during use
• Windows Search indexing: runs after new file additions — temporary
• Third-party backup software: configure to run overnight

If you see an unfamiliar process consuming significant resources, search for it online — it may be malware, or it may be a legitimate system process.

10. Upgrade Your Browser#

If you're running an outdated browser, you're missing performance improvements that are meaningful on older hardware. Chromium-based browsers (Chrome, Edge, Brave) update automatically, but check that auto-updates are enabled. On older hardware, consider Brave — it blocks ads at the browser level, which reduces page load times and RAM usage significantly compared to Chrome.

11. Check Your Storage Type#

If your computer uses a traditional spinning hard drive (HDD) and you haven't upgraded, this is the single highest-impact hardware change available for under $60. An SSD is 5–10x faster for read/write operations than an HDD — the difference in everyday use (boot time, app launch, file operations) is dramatic. Compare SSD vs. HDD to understand the performance gap.

Cloning your existing drive to an SSD (keeping all your files and applications) typically takes 30–60 minutes with free software like Macrium Reflect (Windows) or Carbon Copy Cloner (Mac).

12. Increase Virtual Memory (Windows)#

If your PC has limited RAM (under 8GB), increasing virtual memory (the portion of your hard drive Windows uses as overflow RAM) can prevent slowdowns when running memory-intensive applications.

Search "Adjust the appearance and performance of Windows" → Advanced tab → Change (under Virtual Memory) → uncheck "Automatically manage" → set custom initial size to 1.5× your installed RAM and maximum to 3× RAM.

This is a workaround, not a replacement for more RAM — but it prevents the worst slowdowns on low-RAM systems.

13. Run the Windows Performance Troubleshooter#

Windows 11 includes a built-in troubleshooter that diagnoses and fixes common performance issues automatically.

Go to Settings → System → Troubleshoot → Other troubleshooters → find "Power" and run it. Also run System Maintenance: search for "Perform recommended maintenance tasks automatically" in the Control Panel and run it.

14. Consider a Clean Windows Reinstall#

If you've tried everything and the computer is still slow, a clean Windows reinstall is the nuclear option — but it works. Years of accumulated software, failed uninstalls, registry bloat, and configuration changes stack up in ways that individual fixes can't fully clean. A fresh install on the same hardware often makes a 5-year-old computer feel new.

Windows 11: Settings → System → Recovery → Reset this PC → "Keep my files" option reinstalls Windows while preserving personal documents. The "Remove everything" option is more thorough but requires reinstalling all applications. Backup important files first regardless.

For Mac users, Windows vs. macOS is worth revisiting — macOS has significantly better memory management than Windows 11 on equivalent hardware, which is one reason Macs often feel faster with the same RAM specs.

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FAQ#

Why is my computer suddenly very slow?

Sudden slowdowns are usually caused by: a Windows Update running in the background, a background scan by antivirus software, a new piece of software that added itself to startup, or malware. Open Task Manager and check what's consuming CPU and RAM — that will tell you the cause.

Does adding RAM speed up a computer?

Yes, if your computer is running out of RAM. If Task Manager shows RAM usage consistently above 85%, more RAM will make a significant difference. If RAM usage is consistently below 70%, more RAM will have no impact — the bottleneck is elsewhere.

Will clearing the cache speed up my computer?

It can, particularly for browser performance. However, clearing the cache also means your browser has to re-download resources it previously cached — so browsing may feel slightly slower for a day or two while the cache rebuilds. For overall system speed, freeing disk space by deleting old files is more impactful than clearing cache.

Is a factory reset the same as reinstalling Windows?

"Reset this PC" in Windows 11 (with "Keep my files") is functionally similar to a clean reinstall of Windows, but preserves your documents. The "Remove everything" option is closest to a factory reset on a PC. Either option reinstalls the operating system files clean, which is the main performance benefit.