Windows 11 on the same hardware that ran Windows 10 smoothly can feel sluggish — not because the hardware got slower, but because the OS added background services, telemetry, widgets, and startup programs that accumulate over time. Most performance problems have simple causes. Work through this checklist before you buy new hardware or reinstall Windows.
What changed in 2026
- Windows 11 24H2 and beyond shifted more system processes to background AI features (Recall, semantic search indexing). These can be turned off if you do not use them.
- Startup app bloat from third-party installs is worse than ever — almost every app installer now opts you into a startup entry.
- NVMe SSDs under heavy sustained load benefit more than ever from having 15–20 % free space; Windows reserves space for virtual memory, update staging, and system restore.
- Power plans still default to Balanced on many OEM machines, which actively throttles clock speeds to save power even on plugged-in desktops.
Step 1: Clean startup programs (biggest impact)
- Press Ctrl + Shift + Esc to open Task Manager.
- Click the Startup apps tab.
- Sort by Startup impact (High first).
- Right-click anything you do not need at boot → Disable.
Typical candidates to disable: Spotify, Teams (if not required at login), OneDrive sync agent, Discord, Adobe updaters, browser update helpers, and OEM utility launchers.
Reboot after and measure the difference.
Step 2: Free up drive space
Windows degrades when the system drive is over 85 % full. Quick wins:
- Disk Cleanup: Search "Disk Cleanup" → select C: → check all boxes → also click "Clean up system files" to remove old Windows Update files (often 5–20 GB).
- Storage Sense: Settings → System → Storage → toggle on Storage Sense → "Run Storage Sense now."
- Large files: Settings → System → Storage → Other → sort by size. Look for old installers, downloads, and virtual machine disks.
- Windows.old folder: Exists if you upgraded from Windows 10. Disk Cleanup → Clean up system files → Previous Windows installations. Often 10–30 GB.
Step 3: Change power plan
- Search "Choose a power plan" in Start.
- For a plugged-in desktop: select High performance or Ultimate Performance (if visible).
- For a laptop on AC power: High performance during demanding tasks, Balanced on battery.
- Alternatively: Settings → System → Power & battery → Power mode → Best performance.
On many OEM laptops, Balanced actively caps the CPU to 50–80 % even under load. Switching to High Performance removes that governor.
Step 4: Disable visual effects
- Search "Adjust the appearance and performance of Windows" → select Adjust for best performance, or manually uncheck animation, shadow, and transparency effects.
- Settings → Personalization → Colors → turn off Transparency effects.
- Settings → Accessibility → Visual effects → turn off Animation effects.
On machines with 8 GB RAM or integrated graphics, this frees measurable GPU and RAM overhead.
Step 5: Check for malware and Windows Update
- Run Windows Defender full scan: Windows Security → Virus & threat protection → Quick scan → or Full scan.
- Install pending Windows Updates — Microsoft ships performance fixes in cumulative updates. Settings → Windows Update → Check for updates.
Step 6: Disable Recall and AI features (if not using them)
On Copilot+ PCs running 24H2+, Windows Recall and semantic indexing run in the background:
- Settings → Privacy & Security → Recall & snapshots → turn off Save snapshots.
- Settings → Search → Searching Windows → change to Classic indexing if you do not use AI search.
| Fix |
Effort |
Expected impact |
| Disable startup programs |
5 min |
High — direct boot time reduction |
| Free drive space (to >20 % free) |
10–30 min |
Medium–high (especially on NVMe) |
| Change power plan |
1 min |
High on throttled OEM machines |
| Disable visual effects |
2 min |
Medium on older/integrated GPU machines |
| Scan for malware |
10–30 min |
High if infected; low otherwise |
| Disable Recall/AI indexing |
2 min |
Low–medium on Copilot+ PCs |
Common mistakes
Running registry cleaners. They delete benign registry entries, occasionally break apps, and provide zero measurable performance improvement. Microsoft does not recommend them.
Disabling Windows Defender. It has negligible modern performance impact and the risk of disabling it far exceeds any gain.
Not rebooting after each change. Some fixes only take effect after a restart; testing immediately gives misleading results.
Upgrading RAM when storage is the bottleneck. If your drive is 95 % full and you are seeing stutters, free up space before buying RAM.
What to skip
- Third-party "optimizer" and "booster" apps — most are adware or placebo tools that make Windows slower.
- Disabling Windows Update entirely — security patches are not optional; defer them, do not block them.
- Adjusting virtual memory manually unless you have a specific, diagnosed paging issue — Windows manages this well automatically.
FAQ
Why is Windows 11 slower than Windows 10 on the same hardware?
Windows 11 added higher minimum requirements, more background services, and visual effects. The tweaks in this guide close most of the gap.
Does adding more RAM speed up Windows 11?
If you are running 8 GB and frequently hitting the memory limit (check Task Manager → Performance → Memory), adding RAM helps significantly. If memory usage is under 70 %, the bottleneck is elsewhere.
How do I check what is slowing my PC right now?
Task Manager (Ctrl + Shift + Esc) → Performance tab → watch CPU, Memory, Disk, and GPU. Sustained high disk usage (90–100 %) on a spinning HDD is the single most common cause of modern PC slowdowns.
Should I reinstall Windows 11 for a fresh start?
Only if the checklist above does not help and a clean install is practical. A fresh install takes ~30–60 minutes with a USB drive. See How to wipe a hard drive in 2026 as preparation.
Where to go next
See How to fix overheating laptop in 2026, How to improve laptop battery life in 2026, and How to wipe a hard drive in 2026.