Adobe CC, OSX 10.8.4 on a 12 core Mac Pro with a GTX 570 32GB ram, and BM Studio. My RAID is a 3 disk internal raid with 3 3TB disks in RAID 0. The video renders reload properly. The situation would be better if the audio renders reloaded at least but why it needs to render "audio previews" for such simple audio is beyond me. And as I mentioned I went through quite a bit of trouble to make it as easy on Premiere as possible by replacing all of the 44.1 audio with 48/16 wavs.
If u right click your audio on the time line, look at properties. It'll tell u MHz ( mine was 32000). Make sure you render at that when exporting. If you dont it has to rebuild the audio. I run into this when editing zoom calls.
oh, and if it's mono, export as mono
Once i changed it to match, there wasnt an audio export bar at all.
Still an issue 11 years later. Project is 48khz, all audio files are 48khz, and it takes 90 minutes to render an audio preview for a 30 min sequence. if I want to see the waveforms in the timeline.
Yet I can drop any audio file in after effects, press LL, and it magically shows a waveform without any rendering.
Adobe really needs to stop pretending this is a user issue and fix their program.