Im having some major issues with a larger project. Im not sure what the cause is, but my timeline length is about 1h50, I have 24 tracks (mostly audio), and the projects come out to about 56mb in size saves. Nothing scary yet.

However, when saving it takes over 3 minutes (autosave every 10 minutes is a massive pain and so I shut it off). Opening a project? Forget it. I counted 17 minutes on my last one. Im watching the temp folder rebuild history buffers one file at a time, very very very slowly.

The major issue I have currently, is that some tracks are really slow to work on. Like, I can drop a sound file in, and on say track 10 splitting, cutting and moving takes at least 30 seconds (vegas freezes in the meantime). But moving it on a different track, this can be only 5 seconds, or instant. Its very odd. Creating new tracks and dragging new files in seems to go back to being instant.
Not sure what this is or whats causing it, but its made Vegas impossible to use.
I have tried to copy and paste my timeline in a different version (I have installed 17, 19 and 20) but I cant even copy the whole timeline. Once its all selected, I "ctrl+c" and Vegas hangs for about 30 minutes. Pasting in another instance (or version) is the same deal.

Vegas 21, 208. Fresh have done a install, cleaned the cache, cleaned "edit history", cleaned project media, etc etc to no luck. Audio files are all broadcast waves that ive had no issue using in the past. The only 2 video tracks (with one muted) are MP4 H264. Deleting the video makes no difference.

Any ideas?! Hopefully theres SOME trick that could get me up and running again.