Mac Application Not Responding

Mac "Application Not Responding" means an app has frozen and is no longer processing user input or system events. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: App shows spinning beach ball (SBBOD). Finder title bar shows "Not Responding". App may recover on its own or need force quit. macOS waits before declaring app unresponsive. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Application performing heavy computation. Insufficient RAM causing memory pressure. App bug or infinite loop. Disk I/O bottleneck from slow storage. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Wait 30-60 seconds — the app may recover. Force Quit: Command+Option+Esc, select app, click Force Quit. Check Activity Monitor for CPU and memory usage. If recurring, try deleting app preferences and cache. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Mac Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.