Yes, but this isn't the server's fault. For example, one of the failed attempts was because Wazapp tried to parse the code 3 times (3 requests to the server), naturally, the latter 2 failed so that added to the delays.

There are some bugs in registration, and contacts sync seems to take time, at least for me, but besides that, it seems to work fine

Also afaik, S60 showed a "Your friend sent you their location, but location isn't implemented on Symbian" or similar on earlier versions, when location sending/receiving wasn't there, this simply discards the message.