# How to Speed Up a Slow Windows 11 PC

URL: https://www.mytechnician.tech/tips/speed-up-slow-windows-pc/
Published: 2026-04-03 | Updated: 2026-08-10 | Author: Ankit Kumar
Tags: Windows 11, Performance, Optimization
Summary: PC running slower than it used to? Speed up a slow Windows 10 or 11 PC with startup cleanup, disk tuning, driver updates, and fewer background apps.
Recommended app: Ultimate Windows Cleanup Tool — https://www.mytechnician.tech/apps/ultimate-windows-cleanup-tool/ (Microsoft Store: https://apps.microsoft.com/detail/9NZZVBC5QWRN?hl=en-us&cid=mytechnician-web). Optional; every step below uses built-in Windows tools.

## The Problem
Boot takes three minutes and Chrome feels like it is wading through mud. Usually this is startup bloat, a nearly full disk, or a mechanical hard drive—not a mystery virus. Months of temp files, auto-start apps, and background services accumulate until ordinary tasks drag.

## Symptoms
* Several minutes between power-on and a usable desktop.
* Applications that take many seconds to open.
* Cursor lag, or typing that stutters behind you.
* Fans running constantly with nothing obvious open.

## Step 1: Find the Bottleneck Before Changing Anything
Ten minutes of measurement beats an afternoon of tweaks that address the wrong thing.

1. Press `Ctrl + Shift + Esc` → **Performance**.
2. Use the PC normally until it feels slow, then look at which resource is pinned:

| Pinned resource | Cause | Fix |
|---|---|---|
| **Disk** at 100%, drive listed as HDD | Mechanical drive | Step 7 — nothing else will fix it |
| **Disk** at 100% on an SSD | Background service or failing drive | [100% disk usage](https://www.mytechnician.tech/tips/how-to-fix-100-disk-usage-windows-11/) |
| **Memory** above 85% at idle | Not enough RAM, or a leak | [high RAM usage](https://www.mytechnician.tech/tips/fix-high-ram-usage-windows-11/) |
| **CPU** high with nothing open | Background app or malware | Steps 4 and 5 |
| **Nothing** pinned, still slow | Thermal throttling | Step 6 |

Check the **Startup apps** tab too—a long list of **High impact** entries explains a slow boot on its own.

## Step 2: Cut Startup Programs
The largest free win, every time.

1. Task Manager → **Startup apps**.
2. Sort by **Startup impact**.
3. Disable everything you do not need at sign-in: launchers, updaters, chat apps, RGB utilities.

Full walkthrough with what to keep: [disable startup programs to speed up boot time](https://www.mytechnician.tech/tips/disable-startup-programs-speed-up-boot/).

## Step 3: Free Space and Clear Clutter
An SSD above 90% full slows down measurably, and a full C: drive breaks updates.

* **C: nearly full?** [Free up disk space when C: is full](https://www.mytechnician.tech/tips/free-up-disk-space-c-drive-full-windows-11/).
* **Just temp clutter?** [Clean junk files](https://www.mytechnician.tech/tips/clean-junk-files-optimize-pc/) monthly.
* Turn on **Storage Sense**: **Settings** → **System** → **Storage**.

> **Want it automated?** [Ultimate Windows Cleanup Tool](https://www.mytechnician.tech/apps/ultimate-windows-cleanup-tool/) clears junk files, browser cache, and large files in one pass.

## Step 4: Rule Out Malware
Cryptominers and adware produce exactly the symptoms people blame on age—high CPU at idle, fans running, browser slowdowns.

1. **Windows Security** → **Virus & threat protection** → **Scan options** → **Full scan**.
2. Then run a **Microsoft Defender Offline scan** from the same menu, which catches things that hide from a running system.
3. Check browser extensions: [remove malicious browser extensions](https://www.mytechnician.tech/tips/remove-malicious-browser-extensions-windows-11/).

Details: [remove a virus or malware](https://www.mytechnician.tech/tips/remove-virus-malware-windows-11/) and [find and remove cryptominer malware](https://www.mytechnician.tech/tips/remove-cryptominer-malware-windows-11/).

## Step 5: Deal With the Browser
On most machines the browser is the heaviest application by a wide margin.

* Remove extensions you do not use—each is a running process.
* Keep tab counts sane, or use a tab-suspender.
* Edge: **Settings** → **System and performance** → turn on **Efficiency mode**, turn off **Startup boost**.
* See [reduce Chrome's memory usage](https://www.mytechnician.tech/tips/reduce-chrome-memory-usage-windows-11/).

## Step 6: Check Temperatures
A PC that is fast for a minute then crawls is throttling, not worn out—extremely common on laptops more than three years old.

* Install HWiNFO and watch CPU temperature under load. Sustained figures at the thermal limit mean throttling.
* Clean dust from fans and vents; consider fresh thermal paste on an older machine.
* Full guide: [fix CPU overheating and thermal throttling](https://www.mytechnician.tech/tips/fix-cpu-overheating-thermal-throttling/).

## Step 7: Adjust Windows Itself
Small gains, but free:

* **Visual effects:** `Win + S` → *View advanced system settings* → **Performance** → **Settings** → **Adjust for best performance**, or untick just the animations. On an old machine this makes the interface feel noticeably snappier.
* **Power mode:** **Settings** → **System** → **Power & battery** → **Best performance** while plugged in.
* **Pause OneDrive** if you are not actively syncing: click the cloud icon → **Pause syncing**.
* **Background apps:** **Settings** → **Apps** → **Installed apps** → ⋯ → **Advanced options** → set **Background apps permissions** to **Never** for things you rarely open.
* **Update drivers**, particularly chipset and graphics: [how to update outdated drivers](https://www.mytechnician.tech/tips/how-to-update-outdated-drivers/).

## Step 8: When It Is Hardware
If the software work has not helped, the machine is telling you something.

* **Still on a hard drive?** Nothing above compensates. Windows 11 assumes SSD random-access performance. Cloning to even a budget SATA SSD is transformative: [how to clone a hard drive to an SSD](https://www.mytechnician.tech/tips/how-to-clone-hdd-to-ssd-windows-11/).
* **8 GB of RAM with heavy multitasking?** 16 GB is the comfortable target: [how to check and upgrade RAM](https://www.mytechnician.tech/tips/check-upgrade-ram-pc/).
* **Drive health?** Check SMART data before spending anything: [check SSD or hard drive health](https://www.mytechnician.tech/tips/check-ssd-hard-drive-health-windows-11/).

Priority order and costs: [the best PC upgrades to speed up an old computer](https://www.mytechnician.tech/tips/best-pc-upgrades-to-speed-up-an-old-computer/).

## What Not to Do
* **Don't install a "PC booster" that runs constantly.** A background optimiser is itself a background process.
* **Don't use registry cleaners.** No measurable benefit on a healthy install, and a real risk of breaking applications.
* **Don't disable services from a list.** Windows 11's defaults are already conservative; a disabled service surfaces as a baffling failure months later.
* **Don't defragment an SSD.** Windows already runs TRIM on its own schedule.

## The Nuclear Option
When a machine has years of accumulated software damage, a clean install genuinely is faster than fixing it piece by piece: [clean install Windows 11](https://www.mytechnician.tech/tips/how-to-clean-install-windows-11/). Back up first, and set up backups afterwards so the next rebuild is easier.

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Source: https://www.mytechnician.tech/tips/speed-up-slow-windows-pc/ — My Technician, free Windows 10/11 troubleshooting guides.
Related tool: Ultimate Windows Cleanup Tool (Ultimate Windows Cleanup Tool frees up disk space and keeps Windows tidy—temp files, browser cache, registry entries, and large files from one simple app.) — https://www.mytechnician.tech/apps/ultimate-windows-cleanup-tool/
More guides: https://www.mytechnician.tech/llms.txt