I know there could be a million things causing this, but I'm hoping there's some common thing this could be, like "just turn of XXX" or something like that. I'm editing a multicam project with a total of 9 cameras, two are 4k/29.970, 7 are 1080/29.970, and one is 1080/59.940. After working for a minute or two it all just slows down to an unusable crawl. If I restart Vegas I can get another couple of minutes or so.

My system is an AMD 5950x, 3080RTX (10gb - I know, not much), 128gb RAM (which is not even close to being maxed out), and all software, including the graphics driver and Windows 11 is up to date. I'm using Vegas 23 build 302, but the same happens with 26 Pro

Again, I know there could be a million factors, but hopefully someone has something that might help. I've done a couple of other projects like this but not for a few years, and didn't have this problem then. Same computer, though obviously a million Windows updates since then. Thanks for any help!