MXF waveform (peak files) generation take too long time

This is actually a legit bug / broken feature. 

Working on project with ~6hrs of footage and Premiere insists on reading out the entire MXF file (audio and video) instead of just the audio portion to create the .pek files. I thought this was just a Sony FS7 thing but now its happening with ProRes files wrapped in MXF as well.  I know anecdotally that Premeire generates pek files much faster with quicktime .movs as it seems to be able to parse the audio separate from the video track. 

I would actually reccomend any DoPs shotting Arri cameras not to use the .MXF wrapper if they are just shooting ProRes4444 becasue it really slows down the waveform generation as Premiere currently has to read the entire very large 4444 video frames into ram to generate an audio waveforms. Don't ask me why this is, but it has worked this way for at least 4-6 years now. If you ever have to nuke your cache for some reason it takes hours for the pek files/wavefroms to come back, especially on spinning disks. 

Like Ann said, turn them off. They'll be generated as you scrub the timeline but you can at least work immediately without waiting for them to generate.

You can turn them off in the Preference but then you wont have any waveforms on any audio file.