selecting a data object in the data manager causes all render windows to refresh - although no object or property has changed.

log output after clicking on a data object:
3726.68 core.con.rndMng: RM::ForceImmediateUpdate() for window 0
3726.73 core.con.rndMng: RM::ForceImmediateUpdate() for window 1
3726.92 core.con.rndMng: RM::ForceImmediateUpdate() for window 2
3727.09 core.con.rndMng: RM::ForceImmediateUpdate() for window 3
3727.53 core.con.rndMng: RM::ForceImmediateUpdate() for window 3

Clicking on a already selected object refreshes render window 3 (the 3D window) - although no object or property has changed.

log output for clicking on the same object again:
3781.59 core.con.rndMng: RM::ForceImmediateUpdate() for window 3

For complex scenes with transparent surfaces or volume rendering, this is killing performance.