Recently Firefox, Chrome, and Edge use too much CPU and it’s annoying that my fan is going full speed for an extended period. After looking around I found that cpulimit exists on macOS and Linux to clamp a process to a given CPU percentage, but it works per-PID and doesn’t track respawns.

So naturally I wrote cpulimitd to wrap it. Give it a TOML config:

1
2
3

[processes."firefox"]
limit = 40
include-children = true

It scans running processes every N seconds, matches names against patterns, spawns cpulimit for each PID, and re-limits if a process dies and respawns. Config reloads every cycle — no restart needed.

It has two commands:

• cpulimitd — daemon mode. Runs until killed.
• cpulimitd list 10 — shows top N CPU processes. The NAME column is what you put in config.

Code: github.com/minhhh/cpulimitd