Preview mode since Version 9 not so smooth than before

I’m not sure how to express my individual impression comparing 5.0b3x and 5.0b4x. It seems to me that the preview mode is more jerky and not so smooth like before. (@Bastian: in german we say “läuft ruckelig”). I hope that FM5 does not need a more powerful graphic card than mine (NVIDIA GeForce GT 755M 1024 MB). My environment still 10.11.1, processor 3,2 GHz Intel Core i5, mem 16 GB 1600 MHz DDR3

How can I correct an post? Naturally “since FM V50.b40”