I have done a clean install of my OS and all Applications, I do this at less one time a year do to all the things I install to try out. Most of you will not need to do that. I always enjoy using a clean installed OS as it run much faster and I have gotten back drive space that I have lost. Now I may get email about this next part, but no matter what OS you run over time they will start to run slower. Now most people will not see it because it is happen over time. So if you feel that you system is running slower and the OS was installed more then a year ago you may want to think about doing a reinstall of your OS.
This is just one thing that may help you get more time out of your systems. If you are like me at this time we all need to find ways to save money and time.