Huge FPS drops in dungeons post patch

[Xerthus]

Hi, before the 10th february patch I had a solid 60 FPS in dungeons / Blackram / E. supply chain (some drops to 40 when overcrowded). Since that patch, in any 6 players dungeon, each time we start a fight against (even a single) a monster I have drops to 15 fps during all the fight. It makes the game unplayable when it comes to boss ..

 

Also, yesterday while doing the new open instanced area (Nightshade harbor), being ONLY 6 (not 24!) on Trasher (first boss) leaded to 3-5 seconds of freezing (nothing was moving, couldn't move camera, ..). Second boss didn't freeze but made me drop to 10 fps whole fight. Third and last boss were perfectly fine.

 

I don't have any issue regarding 1v1 arena, nor mushin tower, 0 drops.

 

Cpu usage : 40%

Memory usage : 50%

Disk usage : 10%

GPU load : 40 to 60%, 70°C 

[Endzeit]

Same Problem for me... When i try fighting Blackwyrm i get freezes for about 5-10 seconds and die. I'm not able to fight Poh24 without freezes. 

My CPU and GPU Load are at about 20% (i7 4790k // GTX 780 GLH). The Game is installed on a SSD just for games.

I even tried the low PC spec mode.. no changes.