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Fix Slow Windows PC Performance

Complete guide to diagnosing and fixing Windows performance problems. Covers slow computers, high CPU usage, memory leaks, disk bottlenecks, slow boot times, and laggy applications on Windows 10 and 11.

A slow PC is the most common Windows complaint. Performance issues stem from many sources: too many startup programs, background processes consuming CPU and RAM, disk fragmentation on HDDs, thermal throttling, Windows services misbehaving, or simply running out of resources. This hub collects every performance-related troubleshooting guide, automated repair, and diagnostic tool in one place. Whether your computer is slow to boot, freezing during use, or running hot — start here.

Fix Guides

Automated Repairs

Error Codes

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Troubleshooting Guides

In-depth guides with symptoms, causes, and step-by-step solutions for each problem.

Automated One-Click Repairs

These automated repairs fix the most common problems in this category with a single click.

Related Error Codes

Common Windows error codes associated with this topic. Click any code for a detailed fix guide.

MEMORY_MANAGEMENT

ERROR_TIMEOUT

FILE_CORRUPT

DISK_FULL

CRC_ERROR

UNEXPECTED_IO_ERROR

NOT_SAME_DEVICE

Browse all 160+ error codes →

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RescuePC Toolkit includes 108+ one-click repairs for Windows 10 & 11. Download now and fix windows performance & speed problems in minutes.

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Fix These Problems Automatically

Troubleshooting Guides

Slow Computer

High CPU Usage

Slow Startup and Boot Time

Computer Freezing and Hanging

Low Disk Space

100% Disk Usage

High Memory (RAM) Usage

Slow Windows 11

Laptop Overheating

Programs Not Responding

GPU Usage at 100%

Low Gaming Performance and FPS Drops

File Explorer Slow or Not Responding

Windows Slow After Update

Windows Explorer High CPU Usage

Windows Search Indexing Slow

Windows Animations Laggy and Stuttering

SearchIndexer.exe High CPU Usage

Computer Randomly Restarts

Computer Shuts Down Randomly

Windows Temp Folder Too Large

Laptop Fan Running Loud Constantly

WerFault.exe High CPU

Antimalware Service High CPU

Defender Causing High Disk Usage

Runtime Broker High CPU

Windows Services High CPU

Page File Too Large

Defender Exclusions (Stop False Positives)

Font Size Too Small or Blurry

Game Stuttering and FPS Drops

Search Indexing Slow or Stuck

Search Service Disabled

OneDrive Sync Slow or Stuck

Slow Startup After Login

Disk Cleanup Stuck or Frozen

Game Mode Hurting Performance

Laptop Overheating / Throttling

Memory Leak Detection

Night Light Stuck On

Snap Layouts Not Working

Widgets Not Loading

Storage Sense Not Running

Voice Typing Not Working

Laptop Fan Always Running

Disk Quota Exceeded

Power Throttling Slowing Apps

Search Indexing Broken

Sleep Mode Not Working

Shutdown Takes Forever

Disk 100% After Boot

WSL2 Using Too Much Memory

System Idle Process High CPU

Explorer High Memory Usage

Memory Compression High Usage

Disk Cleanup Not Freeing Space

Automated One-Click Repairs

Boost Performance

Remove Temp Files

Fix Startup Issues

Fix Slow Boot

Check Disk Health

Related Error Codes

Related Troubleshooting Topics

Windows Crashes & Blue Screens

Windows Update & Installation

Windows Hardware & Devices

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