Clean Install VS Time Machine for "out of the box" performance

Hi all ^^
Just under a year a go I made the leap of PC to Mac and have never looked back, im super happy with my Mac however I have been experiancing a decrease in performance since Ive been using it, back when I was using a PC I clean installed the OS once a year and then proceeded to add my files back, thus restoring my PC to full performance.
Ive been reading around these forums looking at Time Machine backups, hoping to see 'how much' gets restored when you perform a recovery from time machine, and from what I have read is that everything gets restored. So my question is purely for some advice and clarification
"If I want to restore my Macbook to its "out of the box" performance, Is it viable for me to use a Time Machine back up?"
if not
"If Time Machine Back ups wont help restoring performance, Would it be possible to Clean Install and then extract purely the Files from my TM Back up?" I read another user had issues, the Mac recognised the files belonged to another mac and he couldent use them.
So I wont waffle on any furthur, but im looking for the easist way to clean install or restore performance to my Mac, a long term solution I can use each year
Please and Thank you
Em

Thankyou for your answer
Im quite a clean freak when it comes to my PC, I keep my desktop bare, things I dont use remain unloaded.etc
I think as I am without a Defrag or Disk Clean up tool I feel abit helpless to maintain optimal standards. I not very experianced with the in's and out's of computers but all I really want on my Mac are my Files, Applications and the OS, nothing more.
I appreciate your time and experiance, so ild ask instead: In your experiance is it worth performing a clean install? I have hadly any junk on my Mac, and from the tone of your post you beleive a program such as MacKeeper would be sufficent?
Futhurmore a clean install once a year isnt worth it? I depend alot on what people have told me, so I may have fallen victim to a rumour :S

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