Everything was laggy. Tapping on icon took few seconds before the app launced. Once it was launced it ran fine, but when I wanted to get back on task swither it took again few seconds for it to appear and then few seconds more if I clicked myself back to desktop.

Same goes with other UI elementes, like tapping on top bar to bring out the menu etc.

I tried to do few reboots with v36 to see if that helps, but no go. After downgrading to v27 everything runs normal. Though everything was running normal also with v34 & PR1.2.