The issue may be releated to measure layout logic.

Ticked ID: 381352
One thing more I noticed.
Actually I do not think, this issue is a sorting issue, but rather some rendering issue, where the old version is much faster than the new one. 
If you compare the scrolling performance between the new and the old version, also here the old version is significantly faster.
So I think this is a more general issue, something with the rendering - or what you call it - of the visible part of the grid, which are faster in the old version.
Am I the only customer noticing this ?