Wifi hardware not detected

After upgraded to Lion OS yesterday and after some software updates, I always have to restart once when I start up my iMac to allow the wifi hardware to be detected automatically. On a fresh boot-up, the iMac will take a long time to boot up and will go to a login page where I have to key in my password. After logging in, the wifi hardware cannot be detected and I have to restart once to allow the wifi hardware to be re-detected successfully.
Also, Lion OS seems to be a bit laggy as compared to Snow Leopard. There are times where my iMac seems to be less responsive whenever I executed an action or a link on a website.
Anyone encountering this problem as well? Any suggestions?

I have 2 similar threads posted myself. It only happens on a fresh boot after you system has been off for a few hours. When you get to that login page, click restart at the bottom and after it restarts the menu bar will work normally and wifi is back. I have been on the phone with Apple Care about this 3 times and they take it as a non issue. My computer is set for automatic login and not to ask for password on wakeup, but after my machine has been shutdown for more than 2 hours, it always takes a long time to boot and asks me for a password. If I give it the password, the Lion system is slower than poo and wifi and many other things do not function properly.
Next time you get to that login screen, click the restart at the bottom and on next boot everything will work normally.
So far that is the only solution I can find and Apple Care tries to explain the bug to me as a feature of some kind and not a problem with my Mac or Lion. I have the iMac 2011 i5 model... and with Snow Leopard everything was great.
And BTW, even if you do a fresh install of Lion, this bug still remains! I fresh installed twice instead of upgrade and this is the most annoying bug of them all. Have to restart the iMac just to boot, ridiculous.
PS: resetting the SMC did not help the booting problems in my machine. Only fixed the fan problems after installing Lion. Even if you leave the machine unplugged all night, still will does this on reboot. So far from my other thread, I have noticed this issue has been in late model iMacs and Macbook Pros... but hasn't affected the rest of the Mac product lines.
Link to my other threads:
https://discussions.apple.com/message/15829754
https://discussions.apple.com/message/15829568

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