How to Check CPU and Memory Usage on Windows
Identify high CPU or RAM usage and understand which apps are making Windows feel slow.
Before you start
Step-by-step instructions
1. Open Task Manager
Task Manager is the fastest built-in way to check which apps are using CPU and memory.
Press Ctrl + Shift + Esc to open Task Manager directly.
2. Review the Processes tab
In the process list, look at the CPU and Memory columns to see which apps are consuming the most resources right now.
If one non-essential app stays near the top for a long time, it may be responsible for the slowdown.
3. Check the Performance section
The Performance area shows the bigger picture for CPU and memory, not just individual apps.
If CPU stays unusually high for long periods while you are doing simple work, background tasks or a problematic app may be involved.
If memory is close to full most of the time, the system may become sluggish when switching apps or opening more browser tabs.
4. Close or reduce heavy apps
If you identify a non-essential app using too many resources, close it normally first. If it is frozen, end it from Task Manager.
Too many browser tabs, game launchers, sync clients, update tools, video tools, or apps left open in the background.
5. Watch for patterns instead of a single moment
A quick glance is useful, but patterns matter more. If the same program causes high usage every day, it is more likely to be the real source of the problem.
High CPU only while booting may point to startup apps. High memory every time the browser is open may point to too many tabs or extensions.
6. Know when the problem may be hardware-related
If CPU and memory look normal but the PC still feels extremely slow, the issue may involve storage speed, failing hardware, or other system bottlenecks.
If usage values do not seem extreme but the system still stutters badly, investigate storage space, disk health, or outdated hardware next.
Common signs that CPU or memory may be the issue
This often happens when memory is heavily used and Windows has less room to work smoothly.
Persistent CPU load can increase heat and fan activity even when you are not doing anything demanding.
High resource usage can make clicks, typing, app launches, and tab switching feel slower than normal.
About this guide
This guide explains how to check CPU and memory usage on Windows so you can understand why the system feels slow, hot, or unstable. It focuses on the easiest built-in tools and the practical meaning behind what you see.
How to follow this guide
- Open Task Manager and review current process usage.
- Check which apps are using high CPU or memory.
- Review the Performance section for overall system load.
- Close or reduce heavy non-essential apps.
- Watch for repeated high usage patterns that may explain slowdowns.
Why use this method?
High CPU or memory usage is one of the most common reasons a Windows PC feels slow. Knowing how to check these values helps you identify which apps are causing the load and whether the problem is temporary or ongoing.
Frequently Asked Questions
What is CPU usage?
CPU usage shows how much of the processor is currently being used by Windows and running applications.
What does high memory usage mean?
It usually means many apps or tabs are open, or one or more processes are consuming a large amount of RAM.
Is 100 percent CPU always bad?
Not always. Short spikes can be normal, but constantly high CPU usage often causes slow performance and heat.
Can I fix slowdowns by closing heavy apps?
Yes, in many cases. Closing or reducing heavy background apps often improves responsiveness immediately.