I don't know about anyone else on PC but, the moment I turn on "Lightshafts" in the settings and play for about 5-10 minutes. The lights start to flicker in and out as a half second rainbow flashbang.  This issue hasn't been a problem with other season maps.  I was hoping it would have been fixed with the release of Season 15.
My PC Specs:     AMD Ryzen 9 3950X 16-Core Processor 3.5 GHz    32 Gigs DDR4 RAM    AMD Radeon RX 7900 XT 16G    Windows 10 64-bit
I also set my frame rate to max out at 60fps.  As I find doing so makes crossplay work better.