# Canister Output Message Queue Limits, and IC Management Canister Throttling Limits

**URL:** <https://forum.dfinity.org/t/canister-output-message-queue-limits-and-ic-management-canister-throttling-limits/15972>\
**Category:** Developers\
**Created:** [October 19, 2022, 12:15am UTC](https://forum.dfinity.org/t/canister-output-message-queue-limits-and-ic-management-canister-throttling-limits/15972 "2022-10-19T00:15:25Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![paulyoung](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/paulyoung/32/5251_2.png) [@paulyoung](https://forum.dfinity.org/u/paulyoung)\
**Post date:** [October 19, 2022, 4:34am UTC](https://forum.dfinity.org/t/canister-output-message-queue-limits-and-ic-management-canister-throttling-limits/15972/2 "2022-10-19T04:34:25Z")

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For #1, a quick [search](https://github.com/dfinity/ic/search?q=canister+output+queue&type=) revealed this:

> <https://github.com/dfinity/ic/blob/a52bb83dd6fc99072db070ccc905478f5ce4bee4/rs/replicated_state/src/canister_state/queues.rs#L30-L30>

I also spotted this, which seems like it could further limit the number of messages:

> <https://github.com/dfinity/ic/blob/a52bb83dd6fc99072db070ccc905478f5ce4bee4/rs/replicated_state/src/canister_state/queues.rs#L1325-L1330>

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