If you have a brand new Mac, or will be buying one soon, it could be very helpful to check out Lloyd Chambers’s website on how to set it up to run in a very high performance, efficient way. Simple but effective ways to make your new Mac better are to get rid of bloatware, use multiple hard drives and make use of partitions. This is all best done the day your new Mac arrives so make sure you read his site prior to a big computer purchase. His Mac setup article is here (and just follow the links at the bottom of each page for the article to continue.)
Good luck and enjoy!