I haven't noticed anything myself, and I test just then seemed speedy. However last night I had someone order twice because they thought it hadn't gone through. Unfortunately they changed something on the form the second time so it wasn't pick up as a duplicate so I've now had to refund the second order.
Yes, i had a client from USA that said this. It might have something to do with the things that the payment was made near 00:00 hour when maybe there are some maintanece procedrues?
I had no problems with other clients.