Very hight latency with low FPS during raid's event (anniversary)

Since the last patch, I have a very hight increase of latency server and very low FPS during event raid. I have take some captures to illustrate my problem. After the fight the latency is normal with 15~20 FPS what I normally have in an instance where agartha.

For technical details I have an Intel core i5 4210U with AMD R5M330

In a fighting with a talos


During the HK fighting

Normal FPS and latency for me after fighting