How to Fix a Slow Laptop and PC — 15 Proven Speed Fixes (Windows 10 and 11)

A slow laptop or PC is one of the most frustrating computing experiences — especially when it was fast when you first got it. The good news: most slowdowns are fixable without buying new hardware. This guide walks through 15 proven fixes for a slow Windows laptop or desktop, in order from quickest to most involved, covering startup lag, RAM and CPU overload, browser slowness, disk errors, power save mode issues, and when to consider more drastic options like resetting Windows.

If you want to understand why your laptop is slow before fixing it — common causes, diagnosis steps, and brand-specific issues — see our article on why is my laptop so slow — causes, diagnosis, and fix guide.

Quick Checklist — Fastest Fixes First

#	Fix	Time Required
1	Restart your laptop/PC	2 minutes
2	Disable startup programs	3 minutes
3	Check Task Manager for CPU/RAM hogs	5 minutes
4	Run Windows Update	10-30 minutes
5	Clear browser cache	2 minutes
6	Adjust power plan (disable power saving)	2 minutes
7	Disable visual effects	3 minutes
8	Free up disk space	10 minutes
9	Run Disk Cleanup and defrag (HDD only)	15-60 minutes
10	Scan for malware	15-30 minutes
11	Clear cache (system and browser)	5 minutes
12	Check disk health / repair drive errors	10 minutes
13	Upgrade RAM or switch to SSD	1-2 hours
14	Perform a Windows repair install	30-60 minutes
15	Factory reset Windows	1-2 hours

Fix 1 — Restart Your Laptop (Most Overlooked Fix)

Before anything else: restart your laptop fully. Not sleep, not hibernate — a complete shutdown and restart. Windows accumulates memory leaks, background processes, and temporary files during extended uptime sessions. If your laptop has not been restarted in days or weeks, a restart alone can restore significant speed. After restarting, wait 2-3 minutes before opening applications — Windows needs time to complete startup processes before reaching normal operating speed.

Fix 2 — Disable Startup Programs

Too many programs launching at startup is one of the most common causes of a slow laptop — especially slow boot times and sluggishness immediately after turning on. Fix it:

1. Press Ctrl + Shift + Esc to open Task Manager
2. Click the Startup tab (Windows 10) or Startup apps (Windows 11)
3. Right-click any program you do not need at startup and select Disable
4. Common offenders: Spotify, Discord, Teams, OneDrive, Skype, Steam, Adobe updaters, browser extensions
5. Do NOT disable antivirus, audio drivers, or graphics card software

After disabling startup programs, restart your laptop and measure the difference in boot time. This single fix often reduces startup time from 2-3 minutes to under 30 seconds.

Fix 3 — Check Task Manager for CPU and RAM Hogs

If your laptop is slow while running (not just at startup), open Task Manager (Ctrl + Shift + Esc) and click the Processes tab. Sort by CPU or Memory column to see what is consuming resources:

• High CPU usage (80-100%): Indicates a process is overworking your processor. Common causes: antivirus scan in progress, Windows Update running, browser with many tabs, or a runaway process. Wait for scheduled tasks to complete, or end the task if it is not a critical system process
• High RAM usage (85-100%): Your laptop is running out of memory. Close unused applications, browser tabs, and background programs. Long-term fix: add more RAM
• Disk usage at 100%: Common in laptops with HDDs and Windows 10 — indicates your hard drive cannot keep up with read/write demands. Disable Windows Search indexing temporarily, disable Superfetch (SysMain service), or replace the HDD with an SSD

Fix 4 — Run Windows Update (Including Optional Updates)

Outdated Windows installations can slow performance — Microsoft releases optimization patches, driver updates, and bug fixes through Windows Update. Go to Settings → Windows Update → Check for updates. Also check Optional updates — these often include driver updates for your specific hardware (graphics, chipset, network adapters) that improve performance. After installing updates, restart your laptop for changes to take effect.

Note on constant Windows updates: if you notice constant Windows updates lately, Windows is catching up on a backlog of patches. This is normal but temporarily slows laptops. Updates typically complete within a few sessions; performance returns to normal afterward.

Fix 5 — Fix a Slow Browser

A slow browser is one of the most commonly complained-about laptop performance issues, and it is almost always fixable without hardware changes:

• Clear browser cache: Chrome → Settings → Privacy and Security → Clear browsing data → Cached images and files → Clear. Firefox: Settings → Privacy and Security → Clear Data. Do this monthly
• Disable extensions: Every browser extension consumes RAM. Go to chrome://extensions and disable any extension you do not actively use — ad blockers, password managers on multiple browsers, old shopping extensions
• Limit open tabs: Each Chrome tab consumes approximately 100-300MB of RAM. Use tab management extensions (OneTab, Tab Wrangler) to reduce open tabs
• Use hardware acceleration: Chrome Settings → System → Use hardware acceleration when available — enable this to offload rendering to your GPU
• Switch browsers: If Chrome is slow, try Edge (built on Chromium but with better RAM management) or Firefox. Microsoft Edge consistently uses less RAM than Chrome

Fix 6 — Fix Power Save Mode Slowing Down Your Laptop

Power saving mode throttles your CPU and GPU to reduce battery consumption — significantly slowing performance. If your laptop is plugged in and still slow, power save mode may be the cause:

• Click the battery icon in the taskbar (bottom right)
• Drag the slider to Best Performance or at minimum Balanced
• Alternatively: Settings → System → Power and Sleep → Additional power settings → Select High Performance
• For desktops: Control Panel → Power Options → High Performance

To get a PC out of power save mode after it wakes from sleep: press any key or click the mouse first, then wait 10-15 seconds for the CPU to ramp back up to full speed. If your monitor is stuck in power save mode (blank screen), press any key, move the mouse, or briefly press the power button once to wake it.

Fix 7 — Disable Visual Effects for Faster Performance

Windows visual effects (animations, transparency, shadows) consume CPU and GPU resources. Disabling them measurably improves responsiveness on slower hardware:

1. Search for ‘Adjust the appearance and performance of Windows’ in the Start menu
2. Select ‘Adjust for best performance’ to disable all effects, OR
3. Select ‘Custom’ and keep only: Show thumbnails instead of icons, Smooth edges of screen fonts
4. Click Apply and OK

This change is immediately noticeable on laptops with 4GB RAM or aging CPUs — animations disappear but the machine feels significantly snappier.

Fix 8 — Free Up Disk Space

Windows slows significantly when a drive is more than 85-90% full — the operating system needs free space for virtual memory (paging file), temporary files, and system operations. Free up space:

• Run Disk Cleanup: Search ‘Disk Cleanup’ in Start → select drive C → check all boxes → also click ‘Clean up system files’ for additional space
• Delete Downloads folder contents: The Downloads folder accumulates installers and files you no longer need — clear it regularly
• Uninstall unused programs: Settings → Apps → Apps and features → sort by Size to see what takes most space
• Move large files to external storage: Videos, games, and large projects can be moved to an external drive or cloud storage
• Empty Recycle Bin: Deleted files still occupy disk space until the Recycle Bin is emptied

Fix 9 — Clear Cache on Dell, HP, Lenovo, and ASUS Laptops

Clearing system cache removes temporary files that accumulate and slow performance:

1. Press Windows + R, type %temp%, press Enter — delete all files in this folder (skip any that cannot be deleted)
2. Press Windows + R, type temp, press Enter — delete all files here too
3. Press Windows + R, type prefetch, press Enter — delete all files (requires admin)
4. Open Disk Cleanup (search in Start) and run it on drive C
5. Restart your laptop after clearing cache

For Dell laptops specifically: Dell SupportAssist (pre-installed on most Dell laptops) includes a PC Tune-Up feature that automates cache clearing, startup optimization, and driver updates. For HP laptops: HP Support Assistant performs similar automated optimization. For Lenovo: Lenovo Vantage includes system health and optimization tools.

Fix 10 — Scan for Malware

Malware running in the background is a common cause of sudden laptop slowdowns — particularly if your laptop became slow overnight with no other obvious cause. Run a full scan:

1. Windows Security (built-in): Settings → Privacy and Security → Windows Security → Virus and Threat Protection → Full Scan
2. Malwarebytes Free: Download from malwarebytes.com — run a threat scan alongside Windows Defender for a second opinion
3. After scanning, restart your laptop

Fix 11 — Fix Restart to Repair Drive Errors

If Windows shows a ‘Restart to repair drive errors’ notification, your hard drive or SSD has detected file system errors. Do not ignore this — fix it promptly:

• Click the notification to schedule a repair, OR
• Open Command Prompt as Administrator (search cmd → right-click → Run as administrator)
• Type: chkdsk C: /f /r and press Enter
• Type Y when asked to schedule on next restart
• Restart your laptop — the scan runs before Windows loads and can take 30-90 minutes

CHKDSK finds and repairs bad sectors, file system errors, and corrupted entries that cause slowdowns and crashes. Run this if your computer takes a long time to restart, if you hear clicking noises from the drive, or if Windows frequently hangs.

Fix 12 — How to Tell If Your CPU Is Bad or Failing

A failing CPU can cause slowdowns, random crashes, and freezes. Signs of CPU problems:

• Consistently high CPU usage (85-100%) in Task Manager even when no demanding programs are running
• System freezes or BSODs (Blue Screen of Death) during normal tasks
• CPU temperature constantly above 90-95°C under normal use (check with HWMonitor or Core Temp)
• Dramatically reduced CPU benchmark scores compared to expected performance

To check if your CPU is bad: download CPU-Z (free at cpuid.com) to verify your CPU is running at its rated clock speed. A CPU running significantly below its rated speed is either thermally throttling (overheating) or failing. Download HWMonitor to check temperatures — if your CPU hits 95°C+ under normal browser use, the thermal paste needs replacing or the cooling system needs cleaning.

Note: most apparent ‘CPU problems’ are actually thermal throttling from dust buildup in the cooling vents. Clean your laptop vents with compressed air before assuming CPU failure.

Fix 13 — Hardware Upgrades That Actually Make a Laptop Faster

Add More RAM

If your laptop has 4GB RAM, upgrading to 8GB or 16GB is the single most impactful hardware upgrade for everyday performance — typically more impactful than a CPU upgrade. Check if your laptop has upgradeable RAM (many thin and light laptops solder RAM to the motherboard — use Crucial’s online scanner at crucial.com to check compatibility).

Replace HDD with SSD

If your laptop uses a traditional hard disk drive (HDD), replacing it with an SSD is the most dramatic speed improvement possible — boot times drop from 2-3 minutes to 15-30 seconds, application launches 3-5x faster, and overall responsiveness transforms. A 500GB SATA SSD costs $40-60 and is the best value laptop upgrade available. Laptops with HDDs are identifiable by the clicking sound during operation or by checking Device Manager → Disk Drives.

Would Resetting My Laptop Make It Faster?

Yes — a Windows factory reset removes accumulated software, background processes, and registry bloat, returning performance close to day-one speeds. Windows 11 and 10 both include a built-in reset option: Settings → System → Recovery → Reset this PC. Choose ‘Remove everything’ for maximum performance benefit, or ‘Keep my files’ to preserve documents while reinstalling Windows. Back up important files before resetting. A reset is not necessary for most slowdowns — try the fixes above first — but is the nuclear option that reliably restores performance.

For help diagnosing why your laptop is slow in the first place — including Windows 10 specific causes, new laptop slowdowns, and brand-specific fixes — see our article on why is my laptop so slow — causes, diagnosis, and fix guide.

For step-by-step Windows 10 speed optimization from Microsoft, see the Microsoft support — tips to improve PC performance in Windows. For hardware upgrade compatibility checking, see the Crucial memory and SSD upgrade finder.

For guides on laptop performance and choosing the right hardware, see our article on are Lenovo laptops good for gaming — ThinkPad vs Legion performance guide.

Bottom Line

Fastest fix	Restart + disable startup programs — 5 minutes total
Slow browser fix	Clear cache + disable extensions + limit tabs
Power save mode fix	Set power plan to Balanced or High Performance
Drive error fix	Run chkdsk C: /f /r as administrator
Cache clear	%temp% and temp folders + Disk Cleanup
Bad CPU signs	High temp (90°C+), always 100% usage, random crashes
Best hardware upgrade	SSD replacement (HDD laptops) or RAM upgrade to 8GB
Would reset make it faster?	Yes — last resort; back up files first
Windows 10 slow fix	Disable startup programs, update Windows, disable visual effects

Frequently Asked Questions

How do I fix a slow laptop?

Fix a slow laptop in order: restart it fully, disable startup programs (Task Manager → Startup tab), check Task Manager for CPU or RAM overuse and close heavy apps, run Windows Update, clear browser cache, set power plan to Balanced or High Performance (not Power Saver), run Disk Cleanup, scan for malware with Windows Security, and clear temp files (%temp% in Run dialog). For persistent slowness, run chkdsk for disk errors or consider upgrading from HDD to SSD.

How do I speed up Windows 10?

Speed up Windows 10: disable startup programs (Task Manager → Startup), adjust visual effects to ‘best performance’ (search ‘Adjust the appearance and performance of Windows’), set power plan to High Performance, run Disk Cleanup, disable SysMain and Windows Search if disk usage is at 100%, update all drivers via Windows Update optional updates, and free up disk space on the C drive to keep at least 15% free. For older hardware, upgrading RAM to 8GB or replacing an HDD with an SSD provides the most dramatic Windows 10 speed improvement.

Why is my browser so slow?

A slow browser is almost always caused by: too many open tabs (each tab uses 100-300MB RAM), accumulated cache and cookies (clear monthly via browser settings), too many extensions running (disable unused ones), hardware acceleration disabled (enable in Chrome/Edge settings under System), or insufficient RAM causing browser to page to disk. Switching from Chrome to Edge often resolves chronic Chrome slowness as Edge has significantly better RAM management. If the browser is slow only on specific sites, those sites have performance issues rather than your laptop.

Would resetting my laptop make it faster?

Yes — a Windows reset (Settings → System → Recovery → Reset this PC) removes accumulated software bloat, startup programs, and registry clutter, typically restoring performance close to when the laptop was new. Choose ‘Remove everything’ for maximum performance benefit or ‘Keep my files’ to preserve documents. Always back up important files before resetting. A reset is the most reliable fix for a laptop that has become progressively slower over years of use and does not respond to other optimization attempts.

How do I fix restart to repair drive errors?

When Windows shows ‘Restart to repair drive errors’: open Command Prompt as administrator, type chkdsk C: /f /r and press Enter, then type Y to schedule the scan on next restart. Restart your laptop — CHKDSK runs before Windows loads, fixing bad sectors and file system errors. This process takes 30-90 minutes. Do not interrupt it. After completion, Windows boots normally with repairs applied. If CHKDSK finds extensive errors or the same errors recur, the drive may be failing and should be replaced.