IMac - Slow load and wifi problems

I have lion installed on my macbook pro and on my iMac. My macbook pro works GREAT...no problems. My iMac - I am ready to toss out a window. Here are the problems:
INCREDIBLY slow boot up time - 5-10 minutes from off - 5-8 minutes from sleep
The hard drive is constantly working. I can have nothing open and it sounds like the hard drive is constantly spinning
Half the time my wifi hardware is not found on boot up and I have to reboot with slow load times - sometimes taking 20 minutes before I can get logged in to a 'working' computer
A lot of my programs have become slow. Safari can be slow responsive but others that are not apple that have done 'lion updates'
I have my activity monitor running and nothing seems to be hogging resources. My iMac specs are:
2.8 intel core i5
12 gb ram
2 TB hard drive with about 1tb free
I ran the lion update that came out and it did not seem to do much for me.
Anyone have a solution? Anyone tried a clean format and did this work? Lion works great on my laptop and I just need it to work on my main computer as well.
Reba

i think part of the boot up time issue is the amount of windows you happen to have open when you put it to sleep
other is lion upgrade slows it down due to this auto save function
my wifi is also spotty and acts like it can't find itself at times
and this is a brand new imac

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