[SOLVED] Lagg when hosting!

Hello there folks,
I have a problem...
I use the following force host method
in the menu
Then click on a gametype
Type in console
Then it starts my match and I'll fast restart or map restart when there is "Enemys forfeiting"

Now here is my problem:
It laggs really bad, not the usual lagg but its like Frame, play 3 secs, Frame 3 secs, play 3 secs, Frame 3 secs

My NAT is open...
Other people do not lagg! Please help

I dont think this is a problem with your hosting if other people dont lag but not sure

Its probably your PC. Either a crap PC, or you don't have required programs...

Yes it is a problem you have

What is your download / upload speed?

Mine is 2Mbit download, 512kbit upload, i can host for 4 people before it starts to lag...