Auction House delay

Hey,
I wanted to bring attention to problem I'm having when using AH. Lack of complaints seems to suggest that this is problem in my end.
Problem is, when I bid on lots of auctions in a row in quick succession it lags out. First one registers bid instantly and then delay starts. So I click, for example, 10 auctions, first one goes trough and next 9 gets stuck in some bottleneck, after some 5 seconds all 9 remaining auctions get bid on.

Note that this started around 2-3 weeks ago and prevoisly everything was ok.