SimTower is running WAY too fast on Windows 3 DOSBox
 

And when I set it to 3000 cycles it jut makes it lag.

"Options" -> uncheck "Fast Mode" ?

It will not help, zirkoni, if problem is like described: too fast on max, too slow on 3000.

What will help is manual setting cycles to something reasonable. 10 - 20 000 maybe? Experiment yourself!

Thank you :)
It actually did help, but thank you too! :)