ok, i just tried some xavc-s stuff.
some beta testing:
these improved my playback framerate by 30%:
26. set audio to 44.1 in hardware and premiere
audio pref – disable play audio while scrubbing
disable maintain pitch
audio hardware latency 200ms
disable sequence composite linear color
sequence audio settings 32000hz
sequence settings preview file 1920×1080 1/2 size video frame size 3840×2160 then 1/2 size playback
27. in monitor, pull markers together so there’s less tick marks per inch, the playback marker will go
offscreen while playing back.
it seems to me that there’s many many problems with premiere.