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They have instructions on the thread.
[How-To] Root, Recovery, ROM without touching a computer - Android Forums
and
[ROM] ThundeROM V1.6.2 1/22/2011 - Android Forums
But it is very easy.
I've just updated to ThundeROM 1.6. Pretty impressive so far.
Quadrant score of 551 for ThundeROM 1.6 on my Optimus
Oh, and 165mb app space!

ive seen pictures of people that ran thunderom on the optimus s and they can get quadrant scores of 800-1000 but i can only get 611 if im lucky does anyone know how?
You need to install the various buildprops to get your score up. They have links in the TR OP. Specifically flashing to enable JIT and stagefright will give you a rather large jump in your Quadrant score. Just make sure to read the pros and cons.
Yeah it's petty funny. I ran mine today for kicks and scored 944. Enjoy.
i got 1106 on mine, but it was clocked at 864 xD i only clock it that high for quadrant tho
, just how my phone performs when I use it. I had a friend with an Evo check out my phone and couldn't believe it was free. 
can anyone post up a new link to ThunderRom? the one on Mediafire JUST got deleted![]()