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I doubt it will do any good on iPhone 2G. It has/had a whopping 428mhz single core proc/ 128 MB ram and no GPU.
 
Fakeclockup is possibly the most effective over clocking placebo I've ever used. Speeds up the animations. The net effect is it creates an impression that the phone is running quicker and it is incredibly convincing. It's a Cydia tweak and requires the insanelyi.com repo
 
It would be possible but you would need to set the clock speed at the iboot level and thats not a easy task.

Also i'm not sure this would be a good idea as you would kill the battery alot quicker
 
lets just say that nobody has bothered to use the skill that ot would take to do it. now if you want to try go for it. fakeclockup would be a simple way to make it seem faster. your dealing with a almost 5 year old phone now. you can only do so much. ;)
 
Fakeclockup is possibly the most effective over clocking placebo I've ever used. Speeds up the animations. The net effect is it creates an impression that the phone is running quicker and it is incredibly convincing. It's a Cydia tweak and requires the insanelyi.com repo

I prefer to use the original repo, hitoriblog.com/apt/
 
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