We cannot confirm this, in fact we don't have any control over it. Please report if still persists.
I will test again.
I researched, that region align slows performance (tested with region resizing).
If remove aling and use css instead, performance will be good. Just want confirm, that is true and it's normal.
As i understand - the reason is when align is set, server does calculations.
exe demo (2 files, with alings and without)