Few things are as frustrating as a PC that suddenly starts crawling. If your Windows 11 machine has gone from snappy to sluggish, you’re not alone — and the fix is often simpler than you think. By targeting the usual culprits — startup overload, background clutter, and misconfigured settings — you can reclaim that fresh-install feel in under an hour.

4 related posts

Disk space freed by clearing cache (average): 5 GB ·
Boot time improvement by disabling startup programs: 30% ·
Windows 11 recommended RAM for smooth performance: 8 GB ·
Number of unnecessary background processes (typical): 20-40 ·
Performance gain from power mode change (Best Performance): 10-15%

Quick snapshot

1Confirmed facts
2What’s unclear
3Timeline signal
4What’s next

Four key specs, one pattern: Windows 11’s own minimums are generous, but real-world smoothness demands more. Here’s what the numbers actually mean for everyday use.

Specification Value
Minimum RAM requirement 4 GB (recommended 8 GB)
Free disk space needed for smooth operation At least 20% of total capacity
Typical number of startup items 10-20 (disabling non-essential can improve boot time)
Windows 11 release date October 5, 2021
Disk space freed by clearing cache (average) 5 GB
Performance gain from power mode change 10-15%
Unnecessary background processes (typical) 20-40
Boot time improvement by disabling startup programs 30%

How do I make my Windows 11 PC run faster?

Disable unnecessary startup programs

Change power mode to Best Performance

  • Go to Settings > System > Power & battery. Under Power mode, select Best Performance. HP Tech Takes (manufacturer guide) reports this can deliver a 10–15% performance gain in everyday tasks.
  • On a laptop, you may need to plug in to unlock the Best Performance option.

Uninstall bloatware and unused apps

  • Navigate to Settings > Apps > Installed apps. Sort by size and remove anything you haven’t used in the past month. eWeek (enterprise IT news) calls this the quickest single win for reclaiming speed.
  • Pay special attention to third-party antivirus suites and manufacturer utilities — many run background services continuously.

Run disk cleanup

  • Open Settings > System > Storage and turn on Storage Sense to automate temporary file cleanup (Microsoft Support AU (official documentation)).
  • For a manual scrub, type Disk Cleanup in the Start menu, select your system drive, and check Temporary files, Recycle Bin, and Delivery Optimization Files.
Why this matters

The average user reclaims 5 GB of disk space just by clearing cached and temporary files. On a system with limited free space, that alone can eliminate random stutters and slow saves.

Why is my Windows 11 computer randomly lagging?

Background updates and automatic maintenance

  • Windows Update runs scheduled scans and downloads in the background, often during active hours. To control this, go to Settings > Windows Update > Advanced options and adjust Active hours so updates don’t hit while you’re working. Microsoft Windows Learning Center (official guidance) recommends setting active hours to your typical work session.
  • If a recent update caused the lag, roll it back via Settings > Windows Update > Update history > Uninstall updates.

High memory usage from browser tabs

  • A dozen Chrome tabs can consume over 4 GB of RAM. Open Task Manager (Ctrl + Shift + Esc) and sort by memory to see which browser processes are the hungriest (Computerworld (tech publication)).
  • Use Chrome’s built-in Memory Saver mode (Settings > Performance) to offload inactive tabs.

Faulty or outdated drivers

  • Open Device Manager (right-click Start) and look for devices with a yellow warning icon. Graphics, network, and chipset drivers are the most common culprits (eWeek (enterprise IT news)).
  • Right-click a flagged device and select Update driver. For the best results, download the latest driver directly from the manufacturer’s website rather than relying on Windows Update.

System file corruption

  • Run System File Checker by opening Command Prompt as administrator and typing SFC /scannow. Microsoft Support AU (official documentation) explains this repairs corrupted system files that can cause random freezing.
  • If SFC finds issues but can’t fix them, follow up with DISM /Online /Cleanup-Image /RestoreHealth.
The upshot

Intermittent lag usually traces back to one of three things: an update running silently, a memory-hungry browser, or a corrupted system file. Each has a specific fix — and all three take less than 15 minutes to check.

How do I clear the cache in Windows 11?

Clear temporary files with Storage Sense

  • Enable Storage Sense in Settings > System > Storage. Configure it to run every week or when disk space is low. Microsoft Support (official documentation) says this automatically removes temporary files, previous Windows installations, and recycle bin items.

Delete app caches manually

  • Press Win + R, type %temp%, and delete files older than 30 days. Skip any files currently in use (AVG Signal (security research)).
  • Repeat with prefetch (Win + R, type prefetch) — these are temporary files Windows uses to speed up app launches but can become stale.

Clear browser cache

  • Edge: Settings > Privacy, search, and services > Choose what to clear > Cached images and files.
  • Chrome: Settings > Privacy and security > Clear browsing data > Cached images and files.
  • Firefox: Settings > Privacy & Security > Cookies and Site Data > Clear Data > Cached Web Content (HP Tech Takes (manufacturer guide)).

Flush DNS cache

Why is my game lagging even though I have a good PC?

Graphics settings and GPU scheduling

  • Go to Settings > System > Display > Graphics and disable Hardware-accelerated GPU scheduling. Some users on Computerworld (tech publication) report that disabling this toggle eliminated micro-stutter in titles like Valorant and Call of Duty.
  • Open your GPU control panel (NVIDIA Control Panel or AMD Adrenalin) and set the power management mode to Prefer Maximum Performance for each game.

Background apps consuming resources

  • Before launching a game, open Task Manager and close non-essential applications — especially browsers, Discord, and chat clients (eWeek (enterprise IT news)).
  • Check the Processes tab for any app using >5% CPU or >500 MB RAM that isn’t related to the game.

Game Mode and optimization settings

  • Enable Game Mode in Settings > Gaming > Game Mode. HP Tech Takes (manufacturer guide) notes this prioritizes game processes and reduces background interference.
  • In the same menu, adjust Graphics settings to assign high performance to specific titles.

Overheating and throttling

  • Monitor CPU and GPU temperatures using Task Manager (Performance tab) or a free tool like HWMonitor. If temps exceed 85°C under load, thermal throttling is likely causing frames to drop (Netdata Academy (IT monitoring resource)).
  • Clean dust from vents, ensure fans spin freely, and consider repasting the CPU on a desktop that’s more than two years old.
The catch

Game lag on a strong PC is almost always a software configuration issue rather than a hardware limit. Disabling GPU scheduling alone has fixed micro-stutter for many users according to Computerworld (tech publication) — try it before buying new parts.

Why is my internet so slow on my PC but fine on everything else?

Network adapter driver issues

  • Open Device Manager, expand Network adapters, and check for warnings. If you see one, update the driver via Update driver or download the latest from the manufacturer’s site (Microsoft Support AU (official documentation)).
  • Roll back a driver if the issue started after an update: right-click the adapter, go to Properties > Driver, and select Roll Back Driver.

Background bandwidth usage by Windows Update

  • Check Settings > Windows Update > Advanced options > Delivery Optimization. Microsoft Windows Learning Center (official guidance) warns that peer-to-peer sharing can consume significant upload bandwidth, slowing your connection.
  • Set Download bandwidth limits under Delivery Optimization > Advanced options to reserve headroom for gaming or streaming.

DNS configuration problems

  • Switch to a faster DNS provider: go to Settings > Network & internet > Wi-Fi/Ethernet > Hardware properties, click Edit next to DNS assignment, and set it to Manual. Use 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare) (AVG Signal (security research)).
  • After changing DNS, flush the cache with ipconfig /flushdns in Command Prompt.

Third-party firewall or antivirus interference

  • Temporarily disable third-party security software to test if it’s filtering traffic too aggressively. TeamViewer Insights (remote access research) notes that some suites perform deep packet inspection that adds latency to every request.
  • If the internet speeds improve with security software off, whitelist your games and browsers in the firewall rules.

Step-by-step optimization guide

Bottom line: Windows 11 slowdowns rarely need a clean install. Startup apps, a misconfigured power plan, and cache buildup cause the majority of complaints. For everyday users: disable high-impact startup items, switch to Best Performance, and turn on Storage Sense. For gamers: close background apps, verify GPU settings, and check temperatures. The whole process takes under 30 minutes and costs nothing.
  1. Clean startup: Open Task Manager > Startup apps tab > disable every non-essential entry with High impact (Microsoft Support (official documentation)).
  2. Power plan: Settings > System > Power & battery > Best Performance (HP Tech Takes (manufacturer guide)).
  3. Disk cleanup: Enable Storage Sense and run a manual Disk Cleanup targeting temporary files and old Windows installations (Computerworld (tech publication)).
  4. Driver check: Visit Device Manager and update any flagged devices, especially the graphics and network adapters (eWeek (enterprise IT news)).
  5. DNS switch: Change DNS to 8.8.8.8 or 1.1.1.1 for faster name resolution (AVG Signal (security research)).
  6. Game settings: Turn off hardware-accelerated GPU scheduling and enable Game Mode (Netdata Academy (IT monitoring resource)).
  7. System file repair: Run SFC /scannow and DISM /Online /Cleanup-Image /RestoreHealth in an admin Command Prompt (Microsoft Support AU (official documentation)).

What we’re sure about

  • High memory usage from browser tabs causes lag (Computerworld (tech publication))
  • Outdated graphics drivers degrade game performance (eWeek (enterprise IT news))
  • Disabling startup items measurably improves boot speed (Microsoft Support (official documentation))
  • Switching to Best Performance power mode yields 10–15% gains in responsive tasks (HP Tech Takes (manufacturer guide))

What’s less certain

  • Exact trigger for sudden performance drops after certain Windows updates remains difficult to isolate across different hardware configurations (Netdata Academy (IT monitoring resource))
  • Impact of Delivery Optimization on gaming latency is anecdotal; controlled testing is scarce (AVG Signal (security research))
  • Whether disabling hardware-accelerated GPU scheduling helps or hurts depends on the specific GPU and driver version (Computerworld (tech publication))

What users and experts say about fixing Windows 11 performance

Check your power mode and drive space first. Nine times out of ten, Microsoft Support (official documentation) points users to these two settings before anything else — and it usually resolves the complaint.

— Microsoft Support forum moderator

I was about to buy a new GPU when I tried disabling hardware-accelerated GPU scheduling. The micro-stutter vanished overnight. It cost nothing and took 30 seconds.

— Reddit user, r/techsupport

Uninstalling the crapware that ships with a new PC is the quickest, most dramatic speed improvement you’ll get. Pre-installed trials and utilities run background services that eat CPU and disk I/O for no benefit.

— PCMag editor

The pattern across these voices is clear: the biggest wins are also the simplest. A forum moderator points to power and disk settings, a real-world user found relief in a single toggle, and an editor says the shortest path is removing what never should have been installed. For the average Windows 11 user, the implication is straightforward — start with the free, 5-minute fixes before spending money or time on complex troubleshooting.

Related reading: How to speed up Windows 11 performance settings · Windows 11 performance tips and settings

Additional sources

neowin.net, techcommunity.microsoft.com, dataconomy.com

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Frequently asked questions

How do I disable startup programs in Windows 11?

Press Ctrl + Shift + Esc to open Task Manager, go to the Startup apps tab, right-click any entry with High impact, and select Disable. You can also use Settings > Apps > Startup to toggle individual apps (Microsoft Support (official documentation)).

How can I check for malware that slows down my PC?

Run a full scan with Windows Security: go to Settings > Privacy & Security > Windows Security > Open Windows Security > Virus & threat protection > Scan options > Full scan. Third-party tools like Malwarebytes can catch additional threats (AVG Signal (security research)).

Should I disable visual effects for better performance?

Yes, especially on systems with less than 8 GB RAM. Go to Settings > Accessibility > Visual effects and toggle Transparency effects and Animation effects off. HP Tech Takes (manufacturer guide) reports this frees GPU and CPU resources for active applications.

How to free up disk space without deleting files?

Use Storage Sense in Settings > System > Storage to automatically remove temporary files and old Windows updates. You can also run Disk Cleanup and select Clean up system files to delete Windows Update cache and previous installations (Microsoft Support AU (official documentation)).

How to reset Windows 11 without losing files?

Go to Settings > System > Recovery > Reset PC and select Keep my files. This reinstalls Windows while preserving personal documents and photos, though you’ll need to reinstall apps (Microsoft Windows Learning Center (official guidance)).

How to update drivers in Windows 11?

Open Device Manager (right-click Start), expand the category for the device you want to update, right-click it, and select Update driver. For graphics and chipset drivers, downloading directly from the manufacturer (NVIDIA, AMD, Intel) often yields better results (eWeek (enterprise IT news)).

Does Windows 11 run slower than Windows 10?

On identical hardware, Windows 11 typically uses 5–10% more RAM at idle due to added visual features and security layers. However, Computerworld (tech publication) found that with the right settings (turning off transparency, disabling startup clutter), the difference becomes negligible for most users.

How to fix high CPU usage in Windows 11?

Open Task Manager and sort by CPU. Common culprits include Windows Update processes, antivirus scans, and browser tabs. Killing high-CPU processes temporarily is safe, but for a permanent fix, run SFC /scannow to repair corruption, and check for driver updates in Device Manager (Netdata Academy (IT monitoring resource)).

For the average Windows 11 user, the choice is clear: start with the no-cost, 30-minute routine — trim startup items, flip the power mode, and clear the cache — before considering a reset or new hardware. Nine out of ten slowdowns trace back to configuration, not components.