Utility program slows down computer

[Gatoloco]

I have been using Iolo System Mechanic program for about a year.When it performs a registry defrag and compact I have to restart my PC.After this is done my PC is slow and sluggish for a while,but comes out of it after a while.This is very annoying as it requires a restart almost everyday.What's the reason and is it really necessary?

[Beyond_Life]

First of all, is it realy needed to defrag you pc every day? I use Defraggler and CCleaner from http://www.piriform.com on a weekly basis and its not affecting the performance at all. You could try that and see if it makes any difference.