Should I reformat my hard drive?

Hi,
I have a macbook pro running OS X 10.8.5.
I bought this computer only one year ago, never had any issues, was really happy of the switch microsoft to apple, until last Tuesday when for no reasons my computer started lagging intensively right after waking up from sleep. Everytime I try to open a software, try to open a tab in a browser, scrowl,write or even shut down or reduce an application there is a lag of at least 20 to 30 secondes when not more. The startup is also slow.
after spending many hours on this discussion board and elsewhere, here is what I've done so far :
- boot on recovery hdd and run verify disk --> everything is okay
- boot on recovery mode and run an extended hardware test --> everything is okay
- S.M.A.R.T test with ONyX software --> everything is okay
- empty caches with ONyX software
- create a new user to see is the issue is with the preferences --> not change in the problem
- boot in safe mode --> no change in the problem
- called a Mac tech for help : told me to boot on recovery hdd (which was lagging to!!!) to re-install Mountain lion which I did...the first time it crashed, the second time it worked. It seemed fine for an hour...now the problem is back.
really don't know what to do anymore : deleting my whole hard drive and starting back from the sratch? or sending my computer for repair...
I can copy/paste some specific log information on request
thank you !

Back up all data immediately as your boot drive may be failing.
This diagnostic procedure will query the system log for messages that may indicate a hardware fault. It changes nothing, and therefore will not, in itself, solve your problem.
If you have more than one user account, these instructions must be carried out as an administrator. I've tested them only with the Safari web browser. If you use another browser, they may not work as described.
Triple-click anywhere in the line below on this page to select it:
syslog -k Sender kernel -k Message CReq 'Channel t|GPU D|I/O|n Cause: -' | tail | open -ef
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
The command may take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear.
A TextEdit window will open with the output of the command. Normally the command will produce no output, and the window will be empty. If the TextEdit window (not the Terminal window) has anything in it, post it — the text, please, not a screenshot. The title of the TextEdit window doesn't matter, and you don't need to post that.

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Should I reformat my hard drive?

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