RAM SPEED and LATENCY is very important for best performance in Battlefield 2042 with i7-6700K
I should get 3466 CL15 RAM or faster
Now with RAM Overclock (CL15 2666 to CL15 3066) I get 61 FPS 1440P ULTRA
Using higher resolution can also remove effect of CPU bottleneck
I think every 60 FPS to 45 FPS drop in this video is caused by insufficient RAM SPEED... as soon as the game has loaded textures the FPS gets back up to 60
Game is also on HDD , so installing to NVME SSD could help