MainStage with Kontakt via iac midi driver

Hi,

I tried to use kontakt within MainStage, but only 1 instance loaded with only 4 different patches of session horns makes everything superslow.

Using Contact as a standalone outside MainStage seems to work but i get big problems when i use my pitchbend. After i use it i get random pitch bends for a while.

Seems i get something of a midi loop..

Any solution for this??