When I installed Yosemite (clean install, then restoring with Time Maschine) Safari was smooth like silk. But recently every webpage I go (clicking links or going to search bar to type an URL) makes Safari go really slow. First I thought it was a Safari problem because Firefox is running smooth, but then I realised that every time I go to a website (the first 5-10 seconds) the "cprefsd" process appears and uses up to 65-70% of the CPU, making the whole Mac go slow or freeze for a few seconds. What's about Safari and that process? I thought that cprefsd was a daemon of preferences, but I wouldn't ever imagine that it has something to do with webs (it doesn't trigger with Firefox, only with Safari). I've been looking on the preferences folder of my system and user but nothing anormal (like a big amount of plists to check or something like that), so I don't know what's going on but it's quite frustrating to use Safari. Any idea?