Thank you for your replies, I think I'll settle with the Alien death fps fix mod, it solves the issue nicely.
Also the problem still persist with the destruction of large forests, as the falling leaves and twigs appear very much like the blood, but it is nowhere near as much of an issue.

I tried it again!
There is a new and better 16 to16 Balancer :D
And I think it can be opptimised quite a bit befor it reaches it's limits, because you can see to many belts there have to be more undergroundbelts! :D
By the way, it is the secound Balancer i designed. (Actually there is a third, a ...

It was not a bad guess, as I have a unusual setup, with the main screen with Factorio running is connected to my GTX 660 videocard, and my second screen is running on the integrated graphics.
I plugged out my second monitor that was connected to the integrated graphics, the Windows messed up my ...

Hello,
I am experiencing severe fps/ups drop when destroying biters en masse with atomic bombs.
The same ups dorp occours while blowing up larger forests.
Smaller clusters generate less of a drop, but in my case I generated a map with several screen large clusters.

My factory is already at a size ...