I am trying to edit my audio in Vegas Pro. I am setting up a plugin chain to process my recordings to make my voice sound A LOT better. I mostly make tutorial type videos.

Anyway, I have some Izotope plugins that work great. I am trying to add in some Waves plugins (VST) to make them sound even better. However, whenever I play a track with the Waves Plugin's GUI visible, Vegas lags out severely, and after a second or so, the audio will completely cut out. This even happens when all video tracks are muted (only sound playing). The funny thing is, when the GUI is not visible, everything works normally like it should. The VSTs even apply their effects without any distortion or lag. However, it is annoying because if I want to change a setting, I have to pause the video, open the GUI, change the setting, close the GUI, and see how it sounds. I cannot use any of the indicators on the GUI to see what is happening. All my other VSTs work fine. I can even put like 20 of them in a chain and no lag issues. Not that I do that normally, just testing.

Am I missing a setting somewhere? I have tried Options -> Preferences -> Audio Devices and played with the playback buffering and track buffering settings. But nothing changed.

My CPU only runs at about 30-50% when previewing even when all this lag happens. My GPU is barely effected. I have Vegas Pro 15.0. I have also tried this on the trial version of Vegas Pro 18. Still has the same issue.

My Rig: Windows 10, CPU: Intel 7700k, GPU: Asus Strix 1080, RAM: 32GB.

Now for the funny business. When I have three audio tracks in a row, all with the same plugin-chain (even with waves), the third track will allow me to look at the Waves GUI while playing the track with no lag or anything. But when I mute the top two tracks, I get the lag issue. When both the top tracks are unmuted, GUI works great.