Mouse lags while selecting objects in Illustrator 2019 on Windows 10 system

I've gone through a number of other posts about this issue, and unfortunately none of the previous solutions have worked for me.

Every time I select an object with my mouse, I get about 2-5 seconds of lag where the entire program locks up. Occasionally it will also make Illustrator go black for a second almost as though there's a graphical error. There is also often a one-second lag when I undo something. Obviously this is a big issue for my workflow, but it's only showing up in Illustrator. I use After Effects, Audition and Photoshop without any issues like this.

I've tried turning off and on GPU but it doesn't make a difference. I've also tried turning off pixel snap, re-installing, and most of the other things like optimizing windows.

I'm working with a GTX Titan X, 64 gigs of ram, an SSD, Intel i7-6850K and I'm at a loss as to what to do next.

I'd be happy to post a video of the issue as it happens, I just don't know if it's alright to post links here.

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