NoGoodNick - September 21, 2012 at 7:12pm
Re: JB Performance issues
Jailbreaking won't affect the speed of the device, though if you load it full of crap, that will. Sometimes if you load two incompatible things, you may find that something stops working, so it's important to only load things one at a time so you'll know what to remove if anything goes wrong.
They key is that upgrading the firmware doesn't buy you much, while it'll limit what you can do with your phone, whereas upgrading the software (iOS version), will.
I'd visit the Firmware Umbrella website to save your settings (they'll explain about firmware upgrades), then upgrade to iOS v5 (if it's not already too late to do so). That version is fairly easy to jailbreak.