Task Manager Explained: Find What's Slowing Your PC
Task Manager is one of the most useful tools in Windows. It shows exactly what your PC is doing, lets you close frozen programs, and reveals what is slowing things down. Here's how to use it.
Opening Task Manager
- Press Ctrl + Shift + Esc (fastest).
- Right-click the Start button → Task Manager.
- Press Ctrl + Alt + Delete and choose Task Manager.
If it opens in a small window, click More details.
Processes: close frozen apps
The Processes page lists running apps and background processes. If an app freezes, select it and click End task. Unsaved work in that app will be lost.
Click the CPU, Memory or Disk column headers to sort and see what uses the most resources.
Performance: see the big picture
The Performance page shows live graphs for CPU, memory, disk, network and GPU.
| If this is constantly high | It often means |
|---|---|
| CPU near 100% | A program is working too hard, or malware |
| Memory over 90% | Too many apps or tabs for your RAM |
| Disk at 100% | Slow hard drive, updates or indexing |
The Memory page also shows how much RAM you have installed and how many slots are used, which helps if you plan to upgrade RAM.
Startup apps
The Startup apps page shows programs that launch with Windows and their impact. Right-click unnecessary ones and choose Disable to speed up boot times.
App history
Shows how much CPU and network each Store app has used over time, useful for spotting data-hungry apps.
Details and efficiency mode
Right-click a process to use Efficiency mode, which lowers its priority so it doesn't slow other apps. The Details page offers advanced options like setting priority.
Fix a frozen taskbar
If the taskbar or Start menu stops responding, find Windows Explorer in Processes, right-click it and choose Restart.
For more ways to speed up your PC, see our Windows speed-up guide.
Practical Task Manager scenarios
"My PC is slow right now"
Open Task Manager and sort by CPU, then Memory, then Disk. The top item in each column is your prime suspect. Common examples: a browser with many tabs, a cloud sync app uploading files, Windows Update, or an antivirus scan. Wait for background tasks to finish, or close the app hogging resources.
"The fan is loud even when I'm not doing anything"
Sort by CPU. If an unfamiliar process uses a lot of CPU constantly, right-click it and choose Search online to learn what it is. Cryptocurrency-mining malware often disguises itself with system-sounding names. Run a full scan with Windows Security if anything looks suspicious.
"An app won't close"
Select it on the Processes page and click End task. If it keeps freezing, update or reinstall it.
"How much RAM do I actually use?"
On the Performance page, watch Memory while you work normally. If it regularly exceeds 85–90%, adding RAM will help.
Common process names explained
| Process | What it is |
|---|---|
| Service Host (svchost.exe) | Runs Windows services; many instances are normal |
| Antimalware Service Executable | Microsoft Defender scanning |
| Desktop Window Manager | Draws windows and effects on screen |
| System | Core Windows processes |
| Microsoft Edge WebView2 | Used by apps that display web content |
Don't end these unless you know why; Windows needs them to run properly.
Frequently asked questions
Why is "System" using a lot of disk?
Often Windows Update, indexing or antivirus scans. It usually settles after a while.
Is it safe to disable all startup apps?
Mostly, but keep your antivirus and touchpad or audio utilities enabled.
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