Halo 5 Forge Now Runs At a Crawl on Windows 10

I’m having a serious issue with Halo 5 Forge for Windows 10. I own an Alienware 17 inch rig that has a strong graphics card, and normally it runs Halo 5 Forge without any issues. Now…the game is utterly unplayable. It doesn’t matter if I install it to the C Drive or the D Drive, the framerate is so slow it makes the experience a nightmare. Even simple commands now take forever, and the same game used to run silky smooth on the same PC without any problems, even on the highest 4K resolution settings! I have no idea what triggered it, maybe it was a driver update but I know my system is up to date! Does anyone have any ideas of how to fix this, or is anyone else having similar horrendous framerate issues on Halo 5 Forge for Windows 10 that weren’t there before?