IMac - LAGS, especially in Safari! Tried everything please help!

Hey everyone!
I have a desktop iMac and in the last few months it has slowed WAY down and its doing my head in!
I bought it 2 and a half years ago and never had these problems with it. It has 4gb of RAM, 500 gb hard drive and i updated to Lion, which is possibly when it started going wrong!
ISSUES:
-Safari majorly lags, especially with YouTube and other online videos, usually gets to about 30 second in then the video stops and lags so badly it freezes the entire machine, i have to force quit Safari!
-simple things such as searching for a file with spotlight has become such a drag. i type in for example 'work invoice' and it takes roughly about 20 seconds so show anything, it used to show it in about 0.000001 seconds lol!
-pretty much everything is much slower now but the main issue is definitely Safari!
WHAT IVE TRIED:
-ive taken it to my local apple repair shop and they found NOTHING wrong, nothing at all, they had the thing for 3 days and found nothing! they ran so many tests and nothing was wrong with the machines hardware, which is annoying i was hoping it would find something!
-ive repaired all the permissions, reset safari several times, transferred about 200gb worth of stuff to external and still no luck
-removed several start up programs and background programs, still nothing, emptied the cache folder like advised by apple over the phone, NOTHING
Im literally stumped i cannot think of anything else that i can do so im hoping all you Apple experts out there have a simple fix for me because its driving me nuts lol!
PLEASE HELP ME, i love my Mac and i want it back to the way it should be!!!!!!!
Thanks a lot

See:
Mac Maintenance Quick Assist,
Mac OS X speed FAQ,
Speeding up Macs,
Macintosh OS X Routine Maintenance,
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.

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