I've been playing the game since the BETA, and noticed a few graphical glitches and low FPS. At the time, I didn't mind since the game was in a fairly early stage of development. But nowadays, it's unbearable.
With the new update, some of these issues have been fixed and smoothened out, but they still persist. It's incompetent of the devs to add new content, yet leave a lot of optimization by the side. You can't enjoy new content if you can barely run the game.
Some of the issues include, but aren't limited to:
Missing character, weapons and sounds in the beggining of a match.
Annoying stuttering when looking around corners/inside buildings (Probably rendering a new scene) which leads to some pretty bad CQC reactions
Missing reloading/throwing/firing/aiming animations
Windows 7 64 bit
Intel Core i5 6400 @ 2.70GHz
4096MB Radeon RX 470