I use internet a few weeks now with MOSNet, but as far I can see my
internet connection is slow according when I use internet with my
f***pc. Is there any setting I can change?

Some versions of MOSnet had some russian domain in one settings file in db/ directory (which means, that when you try to access f.ex. morph.zone, it will first try to access morph.zone.whatever.ru, which of course doesn't exist, but will slow down considerably)

Just remove that, and it should be faster.