Frames drop to unbelieveable unplayable levels during KOTH sector control gametype.

The only timke this happened to me before, it was very short and usually when a jet did a bombing run. This is constant and affected a lot of the players I was playing with.

The video below highlights the issues:

https://www.youtube.com/watch?v=Bphz3B4_nVI&feature=youtu.be

This is fairly constant, whereas I used to average around 24FPS, it's now become more like 5 which is obviously unplayable. I have tried reducing my render distance to no avail.

CPU usage is around 30-40% and memory about the same.

This has only been happening the past couple of days since the update - I think something went wrong with it.