# High CPU Mixer usage in Unreal 5.7

**URL:** <https://qa.fmod.com/t/high-cpu-mixer-usage-in-unreal-5-7/24020>\
**Category:** FMOD Studio\
**Created:** [February 14, 2026, 10:01am UTC](https://qa.fmod.com/t/high-cpu-mixer-usage-in-unreal-5-7/24020 "2026-02-14T10:01:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dishoa](https://avatars.discourse-cdn.com/v4/letter/d/aca169/32.png) [@dishoa](https://qa.fmod.com/u/dishoa)\
**Post date:** [February 14, 2026, 10:01am UTC](https://qa.fmod.com/t/high-cpu-mixer-usage-in-unreal-5-7/24020/1 "2026-02-14T10:01:57Z")

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Hello, I’ve recently noticed that CPU Mixer started to give me quite high percentages when profiling, we hit around 25% in peak a few months ago during standard gameplay and now we’re around 90% in average with much less running instances.  
I set up a test in an empty level - with 50 running instances, where majority is virtualized the average CPU Mixer total and self is around 2,5% where before it was much lower with Total average around 0.5% and self 0.01%. We switched to Unreal 5.7 recently, are there any known issues with performance running FMOD on Unreal 5.7?

Performance in Unreal 5.7 with 49 instances (46 virtualized):

 ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/f/f7e4395c7e56fb0dc806169f2113004cc33cc5dd.png)

Performance in Unreal 5.6 with 50 instances (48 virtualized):

 ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/8/8bcc422bc870dd8527c83a216de7dfb6d92bb221.png)

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<div class="post-metadata">

**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\
**Post date:** [February 20, 2026, 1:22am UTC](https://qa.fmod.com/t/high-cpu-mixer-usage-in-unreal-5-7/24020/2 "2026-02-20T01:22:54Z")

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We aren’t aware of anything that would be causing this.

The numbers shown in the FMOD Studio Profiler are the CPU time the mixer/update thread is taking. The percentage represents how long it takes, in relation to the amount of time it has to complete a mix. [https://www.fmod.com/docs/2.03/studio/profiling.html#reading-a-recorded-session](https://www.fmod.com/docs/2.03/studio/profiling.html#reading-a-recorded-session)

What version of the FMOD Integration are you using?