It was supposed to be fixed, but it still doesn't work sometimes, they still run through walls and back out to get to you.

Seeing as you don't know which clip is loaded, you can't really tell which clip the bullet count is detailing. The only way you can know is looking at the green bar on ammo clip icons. Yellow chain means the server is confused about the packets that it's sending, Red chain means that there is a connection issue. Either is bad so try not to move too far or do too much with changing your inventory unless the chains are gone.

Server issue, nothing more.

Anti-Aliasing is probably the biggest FPS-Whore. You can always try playing in a lower resolution windowed (like I have to), or you could change launch parameters to increase FPS, such as designating the amount of cores and threads your CPU has, or the maximum and minimum memory the game can use.