Limits - bunny.net Documentation

Feature	Limit	Description
CPU Time per request	30s	Maximum CPU time allocated per request.
Active memory	128 MB	Maximum memory available to isolate instance.
Subrequests	50	Number of subrequests a script can make per request.
Script size	10 MB	Maximum size of the script code.
Startup time	500ms	Maximum time to startup the script.
Environment variables per Script	128	Maximum number of environment variables per script.
Environment variable size	2KB	Maximum size of environment variable value.

These limits cover typical use under normal operating conditions, and they keep one script from taking resources away from everyone else’s. Occasional spikes above a limit are tolerated. A script that consistently hits or exceeds one will be throttled or terminated.

Staying within the limits

Review your script’s code so it finishes within the time and memory limits.
Keep the number of subrequests down, and cache responses where you can.
Watch the logs and statistics for your script so you catch a growing problem before it turns into a limit violation.

CPU Time

CPU time is measured while the script is actually using the CPU to run your logic, and it directly affects how quickly a script can respond. It is allocated per request, so every execution gets the same share of processing time. Infrequent spikes in CPU usage are fine. Going over the limit again and again will lead to the script being terminated.

Last modified on August 17, 2026