Compare to Gminer, how many percent can be increased at hashrate?
yes, it's pretty much the same.
And with teamred?
On AMD there's a noticeable difference (cca 1MH/s higher). Besides that I can see a much more consistent submitted share count compared to Teamred, t-rex and gminer. The graph is not so choppy but almost a nice straight line. This goes for nVidia cards as well.