There is what I believe to be a potential bug in this plugin, I've noticed that ever since I installed it and am now using a few instances of it in one of my scene collections, every time I open the OBS app with that scene collection auto loading, all my video sources appear laggy, they get that way about a second after OBS finishes loading the collection, for the first second they play smoothly.
After going through a screen capture frame by frame, it appears that all my 30fps video sources are now playing at 15 fps instead, not that their overall speed is slower, it just means that each frame stays on the screen for twice as long as it's supposed to and every second frame is skipped, so it looks laggy and lacking the typical smoothness of a 30fps video.
This wasn't a PC resource issue, it turend out to be an OBS/plugin issue.
The workround I've discovered, after trying evry possible permutation of OBS, encoder and Windows settings, is simply to temporarily load up a different scene collection without spectraliser in it, then load the original one back in and the problem disappears.
If I had to guess, I'd say that when you combine OBS boot up followed instantly by spectraliser loading, the plugin interrupts and upsets the codec OBS tries to use to play video sources, might be related to that 60fps bug from earlier iterations of the plugin.
On a lighter note, other than that one thing, great plugin!
Lots of options and flexibility that saves having to buy and set up third party visualisers.