I use n900 in "always online" mode: SIP+Gtalk+ICQ+OVI XMPP, email check every 5 minutes.

It lasts about 18-24 hours of moderate use on WiFi and just 12 or so on EDGE.

Can this be improved? My old e90 lasts almost similar 40 hours on either WiFi or EDGE, no difference. What's wrong with EDGE on n900? And what is the problem with IMAP IDLE?