I have Vegas 19 on both a laptop and a desktop. The playback on the desktop gradually became so bad I had a new system built as I have lots of editing work and needed to sort the issue out quickly.
The new desktop has an I7 12600, an Rtx3060, SSD drives and 32gig ram with Windows 10. Unfortunately video playback in Vegas on the new system is just as bad. Unusable unless I create proxies.
I work with 4k 8bit AVC video.
Interestingly on my old laptop which is like 7 years old, I have no issues playing 4k video in Vegas.
So I have a brand new, reasonably powerful desktop that Vegas is next to useless in and I have an ancient laptop where Vegas works fine. Weird.
Makes no difference if I use GPU acceleration or not.
If I edit using proxies it's OK so it suggests an issue with CPU/ram/ HDD but surely the new system specs are adequate?
I have been forced to quickly learn and start editing using Davinci Resolve where playback is no issue even with various effects etc. I know DR is more reliant on GPU than Vegas but still.
So after many years using Vegas (started with 5 or 6) without issue I'm just about forced to leave it behind.
I just don't have time to create proxies for everything so that's not a solution.
I would still like to use Vegas for a variety of tasks not to mention edit the zillion projects I've created using the software.
I don't believe upgrading to 20 or 21 is the answer either. I've tried VP20 but got rid of it because my essential Waves audio plugins cause 20 to crash.
Sorry for long post but if anyone has any suggestions on what is causing VP19 on my desktop to playback video so poorly I'm all ears!
I generally playback video using 'preview auto'