HT201250 My MacBook is slow.  I have a cleanup programme and I do not have many applications.  I would like to clean the disk and restore from Time Machine.  Will it still be slow?

I am frustrated having paid for "Clean My Mac" which I run regularly and using tips like cleaning the cache in Terminal view.  It is still getting slower.  Can I clean off the disk and reinstall from my Time Machine, or will it re load the problem too?  How do I do this anyway?

See:
How to eliminate slow Mac problems,
Mac Maintenance Quick Assist,
Mac OS X speed FAQ,
Speeding up Macs,
How to Speed up Macs,
Macintosh OS X Routine Maintenance,
Mac troubleshooting: What to do when your computer is too slow,
Essential Mac Maintenance: Get set up,
Essential Mac Maintenance: Rev up your routines,
Maintaining OS X, 
Five Mac maintenance myths and
Myths of required versus not required maintenance for Mac OS X for information.
iMac refurb (27-inch Mid 2011), OS X Mavericks (10.9.4), SL & ML, G4 450 MP w/Leopard, 9.2.2

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