I´ve found another problems with midi…
When renoise GUI is choppy because of VSTi open gui (for example Dune CM on a second monitor), midi input is also somehow brokend and plays bad, unresponsive. Computer keyboard isnt influenced. There wasnt this problem with 2.8.
I will try to record video, problem will be more obvious then
(I think it heavily relates to dual-screen renoising)