For the last five years we have used an iMac for routine stuff, nothing very exacting and certainly nowhere near to its capability; of late we have noticed that it is very slow to boot up, change profiles, or work in general. Knowing little or nothing about these machines I have failed miserably to find any inbuilt utilities to speed things up or clear out the accumulated rubbish I can only think is degrading its performance. Can anyone point me in a sensible direction as web searches only provide me with the opportunity to purchase even more stuff I know little about.