Channel switching extremely slow on first access to channel

This is unique to 12.10, even though quassel is the same version in 12.04. Investigation in progress.

Proposed release note:

Quassel performance with regex ignore rules in 12.10 can considerably slow switching into a new IRC channel. Unselecting all ignore rules that use regular expressions will mitigate this issue.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: quassel-client 0.8.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic i686
ApportVersion: 2.6.1-0ubuntu3
Architecture: i386
Date: Thu Oct 18 15:46:55 2012
EcryptfsInUse: Yes
InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
ProcEnviron:
 LANGUAGE=
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: quassel
UpgradeStatus: Upgraded to quantal on 2012-10-06 (11 days ago)