Vegas hangs if you apply - VST3 spectral denoise (izotope 10 or 9).
Hangs every time from the moment you apply that particular VST plugin, so it is unusable.
It should be easy to reproduce. See my signature for my system.
Media is coming from Sony RX10 III camera:
Video: 00:00:11,040, 25,000 fps progressive, 3840x2160x32, XAVC-S
Audio: 00:00:11,040, 48 000 Hz; Stereo, PCM