Playback is slightly lower quality (fine when paused)

So playing back on the timeline is at a slightly lower quality, it resumes it's proper quality when I pause it, and it's also fine on exporting

Anyone know what setting might be causing this? it isn't a huge drop in quality, and there are no proxies, it seems to happen when I have 4k in a 1080 timeline, but like I said on export the problem vanishes

Thanks for any insight!

Performance mode is enabled probably.

It's not performance mode. But this is exactly what Timeline Proxy Mode does-- dynamically reduce resolution during playback only. It's kind of a poor name since can be confused with Proxies... but it's just a resolution reduction during playback, nothing to do with actual proxies.

Bottom of page 162 in the manual.

It's not performance mode. But this is exactly what Timeline Proxy Mode does-- dynamically reduce resolution during playback only. It's kind of a poor name since can be confused with Proxies... but it's just a resolution reduction during playback, nothing to do with actual proxies.

Bottom of page 162 in the manual.

It was performance mode for me this time
So hidden away I'd never noticed it before