Frame time and latency issue

Hi Guys!

I don't know if any of you have had problems with lags while killing monsters. As soon as my trap deals damage to a larger pack of monsters, the game stutters and I see a big spike in both Frame time and Latency.

Video: https://www.youtube.com/watch?v=4bhTgWWAy7o

I tried all three of the networking modes:
Auto, Lockstep and Predictive
I haven't noticed any difference.

I also tried to adjust the graphic settings ingame:
- VSync, Post processing and Screen shake on/off combinations,
- Texture filtering is always Trilinear filtering (the lowest you can choose)
- Shadow quality and Antialiasing quality is always Off
- Texture quality medium / high, I haven't noticed any difference, still had lag spikes

I tried to change the gateway:
In case of Paris or Frankfurt, it shows ~36 ms, which I think to be pretty good.

My specs:
Processor: AMD FX 6350 Six Core
Graphic card: AMD Radeon HD 7850 (2Gb)
RAM: 8Gb
Windows: Windows 7 Ultimate (64 bit)
Cooler: Actic Freezer Extreme Rev. 2 (http://cdn0.bluechip.hu/img/cache/1/9a/arctic_cooling_freezer_xtreme_rev_2__intel__amd_.jpeg)

Interesting, but I also have this ingame stuttering / screen jumping when I am just walking around in the city (and there are no special effects, like explosions).

Please if you guys have any idea how to solve this annoying stuttering problem, please let me know, I can't even do a Lab run because of this lag issue.

EDIT:

I reinstalled the game, it helped a bit, but I still have the lag spikes.
I also just realized that I have these lag spikes since the new patch.