[ENHANCEMENT] - Pre-render audio waveforms.
The waveform preview constantly loads form the file and doesn't update during playback if it wasn't on screen at the start of playback.
This could be an easy fix by creating an image file of the audio track. I know that's how Audition does it. When scrubbing up and down on a zoomed timeline you have to wait for the waveform to update constantly.
This is something normal in every DAW or Video Editor I've used before.