Hi..
It helps to mention which OS X installed on your Mac.
Click the Apple top left in your screen. From the drop down menu click: About This Mac
Which version do you see?
The best thing for your Mac is not install third party cleaning utilities to speed up your Mac. They can do more harm than good. Your Mac runs maintenance in the background > Mac OS X: About background maintenance tasks
Not enough free storage space can slow your Mac down.
Click your Apple menu icon top left in your screen. From the drop down menu click About This Mac > More Info > Storage. Make sure there's at least 15% free disk space.
Reindexing Spotlight can help> Spotlight: How to re-index folders or volumes
More tips here > Why is my computer slow? | Apple Support Communities