I've noticed a massive performance drop with my Ryzen 1920X as of late.
Ryzen TR 1920X (OC'd to 4.0 for a day then restored to default settings)
32 GB RAM (corsair)
Samsung Pro Evo 920 NVMe
Asus RoG GTX1080 Ti
PUBG down to 70 FPS from 140
Escape from tatrkov down to 15-20 from 60
Warhammer vermintide 2 running at 80 FPS on medium graphics
Loooooooooooong photoshop opening times (25 MB PDF opening for 5+ mins)
Noticed its mostly a single core spiking to 100% while others are idle for all those above.
All drivers including BIOS up to date (according to easy driver).
Temps pretty normal, all-in water cooling installed on the CPU.
2 weeks back had a Windows (i think it was windows) bug where sudenly only a single core/thread was detected computerwide. Detected chache memory was 1/12th of the usual, not other core detected neither in device manager nor monitoring programs. System wipe helped, back to normal but I feel like the performance is lacking since (already started before, to a lower scale). Illustrated below.