MS Outlook (since v2003) provides the same (?) useful feature out of the box. ToDo's based on emails, chat, sms, (or any other msg obj) and metadata based filt

MS Outlook (since v2003) provides the same (?) useful feature out of the box. ToDo's based on emails, chat, sms, (or any other msg obj) and metadata based filters are very useful. I created dozends of advanced filters in GMail in 2006, as my first account grew to 5 GB (thanks to about 20 of mailing list) in 2009 my GMail account got unbearable slow. I had to create a new account (the advanced filters are still there, but there is no intuitive UI anymore, you have to type in their syntax). I occacionally login to my old account and it is still dog slow - so I have my doubts that advanced filter scale in GMail/Inbox.