# Stuttering after upgrading 2.01 to 2.03

**URL:** <https://qa.fmod.com/t/stuttering-after-upgrading-2-01-to-2-03/22853>\
**Category:** Unity\
**Created:** [April 29, 2025, 3:47am UTC](https://qa.fmod.com/t/stuttering-after-upgrading-2-01-to-2-03/22853 "2025-04-29T03:47:52Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![kalman](https://avatars.discourse-cdn.com/v4/letter/k/59ef9b/32.png) [@kalman](https://qa.fmod.com/u/kalman)\
**Post date:** [May 7, 2025, 8:16am UTC](https://qa.fmod.com/t/stuttering-after-upgrading-2-01-to-2-03/22853/6 "2025-05-07T08:16:41Z")

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I just tried updating to 2.02 instead of 2.03 and the stuttering issue is there as well.

Another data point is that a mission with way fewer vehicles on it - and so way fewer events - does not seem to stutter.

edit: I tried putting a bus instance limit of 4 on the engines and it seems to have fixed the stuttering. It’s not a solution unfortunately (I just posted [Group bus instance limiting for continuously playing events](https://qa.fmod.com/t/group-bus-instance-limiting-for-continuously-playing-events/22914)) and it’s still a mystery to me why this is working in FMOD 2.01 but not 2.02/2.03. It makes me a little nervous to update even if I do get the custom limiting code to work.

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_[View the full topic](https://qa.fmod.com/t/stuttering-after-upgrading-2-01-to-2-03/22853)._