CPU Preview disabled and poor performance on 21.6

InDesign 21.6, Tahoe 26.6.2

Mac Studio M4 Max, 16 CPU Cores, 40 GPU cores, 128GB unified memory. My hardware should not be struggling like it is. 

InDesign 21.6 introduced “new rendering technology to deliver a more consistent viewing experience” and the only consistent thing I have noticed is the performance being degraded. 

I am unable to use CPU Preview to even see if there is a performance change. Disabling GPU performance does not make CPU Preview clickable. I am not sure why this is the case, a restart did not fix. 

I am experiencing near-constant app hitching when doing any action, as well as constant white flashes while moving text boxes and graphics. If I pick up any graphic and move it, it basically freezes my app for a second or two before “catching up” with the processing and showing my movement 1-2 seconds after it happened with lots of stuttering. 

The white flash occurs every time you mouse click + drag on an item. It only occurs with the first mouse click and doesn’t persist while dragging, but it will occur with every click. 

This behavior was common for me when using CPU preview on previous versions and would occasionally happen on GPU preview, but it is now far more consistent. I will note that this happens in files with placed .PSDs possibly, if I open up a blank file it runs smoothly. It is likely due to heavy graphics/placed images, however my file size is only 40mb and all my files are linked locally… Either way, these are working files for production and I need to be able to work on them without being flash-banged every literal second. 

It also seems that as I scroll from page-to-page, InDesign is persistently reading all my .psds which coincides with laggy performance. I turned off Preflight to see if that made a difference and it seems to have not done anything.