AutoHotkey Script High CPU Usage: How to Fix It
By AutoHotkeyTools Editorial Team · Updated October 6, 2026
Quick answer: High CPU usage usually comes from tight loops, aggressive timers, or repeated window checks without an appropriate wait.
Find busy loops
A loop that never sleeps can continuously consume a CPU core. Add event-driven logic or a reasonable wait where appropriate.
Review timers
Very short timer intervals can create unnecessary work, especially when each callback performs window or file operations.
Frequently asked questions
What is the first thing to check?
High CPU usage usually comes from tight loops, aggressive timers, or repeated window checks without an appropriate wait.
Does this apply to AutoHotkey v2?
Yes. This guide is written with AutoHotkey v2 as the default unless a legacy behavior is explicitly mentioned.