Why Is Atom So Slow or Using High CPU

How to fix it

// try these in order, the most common fix is first

1. FIX 1Test in safe mode

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   1. 01Run: atom --safe
   2. 02If fast, a package is responsible
   Did this fix it? Yes No

2. FIX 2Disable heavy packages

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   1. 01Disable packages one at a time and restart
   2. 02Reports blame file-icons and PlatformIO integrations in particular
   Did this fix it? Yes No

3. FIX 3Use a faster editor

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   1. 01Try Sublime Text or Zed for speed
   2. 02Or Pulsar, which continues Atom development
   Did this fix it? Yes No

Symptoms

Fans spin, typing lags, CPU or memory stays high.

Why it happens

• C-01A heavy package using high CPU
• C-02Very large projects
• C-03Electron-based architecture and no further optimization

// this guide also covers

• why is atom so slow
• atom high cpu usage
• atom editor lagging

The same problem in other apps

All slow, laggy or resource-hungry guides →

• VS Code High CPU Usage (VS Code)
• Why Is Pulsar So Slow (Pulsar)
• Sublime Text Slow or Glitchy Display: Indexing and GPU Settings (Sublime Text)
• Zed Slow on Linux Laptop (Using Wrong GPU) (Zed)
• Why Is Vim So Slow? (Large Files & Long Lines) (Vim)

Other Atom errors

• Atom Shut Down: What to Use Instead
• Is Atom Editor Dead? Can You Still Use It
• How to Migrate From Atom to VS Code
• How to Migrate From Atom to Pulsar
• Atom Not Opening or Won't Start
• Atom "The Editor Has Crashed" Error
• Atom Package Install Fails (apm Error)
• Atom "Failed to Load" or "Failed to Activate" Package Error