I just loaded up the android app for the first time after booting. 5 seconds before I could see balance, another 15 seconds before the graph loaded. It used to be fast, but I hardly use it any more because it's slow to check my balance.
That said, since I changed some settings to reduce battery/data usage, the notifications for spending often don't turn up for several minutes, where they used to be instant (before being able to put my card back into my wallet).