The delay problem MIGHT be solved with the new version.
I'm saying MIGHT because it has worked fine from time to time before, so I'll check a few times and if it stays fine, I'll report in the Bugtracker thread.

Another thing I noticed:
I have selected "always online". I can see myself as online on my PC, but when I close Mitakuuluu, my status changes to "last seen". Connection still works fine, I get all messages. When I open Mitakuuluu again, I am *still* shown as not online, even when I write with my PC account. I have to change setting to "always offline" and back to "always online" and then I'm correctly shown as online again.

But that's a minor problem, I usually have Mitakuuluu always open, anyway.