I'm having the same exact issues and it's driving me absolutely NUTS. I have no way of reverting back to 22H2 sadly as I did a clean install with a bootable USB when upgrading as I do this every couple of years anyways and the time had come for it. Getting horrible massive frametime spikes in games with an R5 5600 & RTX 2070 setup (I'm upgrading to a 4070 next month) and I'm getting sick of it. Microsoft need to fix these issues in their next updates, I'm starting to have a feeling that it's something to do with AMD CPUs having incompatibility issues with 23H2 as I'm noticing that almost every person I'm seeing reporting on this have AMD Ryzen CPUs.
