I am wondering what is update frequency for Past Performance section?

I can see my statistics updated in random times. For example on May 29th morning I could see my statistics from May 29th. On the other hand I few days ago I had to wait for update 1 or 2 days.

I know that sometimes statistics date get stuck on EA side. I am talking about situation when I get ma statistics up to date in my STATS section.

Does the update dependes on timezone? I live in Europe (CEST = UTC + 2 hours).