My problem was that smartsearch/tracker used 100% CPU för about 10 seconds after every received/sent SMS, with idle usage about going up to 50mA. Not as extreme as some other reported. Fix was to clear ~/.cache/tracker and lose lots of data :-( Problem might have been that I had about 10k SMS after a few months usage... Using PR1.2 since 1 week ago, problem might have existed before but without symptoms.