EUW slowest to release new patches?

I was playing around with the launch client by switching regions while waiting for a friend and I found other regions already had the 6.19 patch while we r still on 6.18. Maybe its because of time zones? Is Euw always the slowest to release patches? I know 6.19 is due to release tomorrow and a single day doesn't really matter but I'm just curious :)
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