Everyones devices gets a little sluggish after a bit, months and months of adding useless crap and themes and tweaks. This is a quick tutorial to help you clean out your iDevice, it's spring right? Time to do some cleaning.
Download the Cydia app, Backgrounder. Go into the options and have it set so that all applications will quit when you exit them. Feel free to add overrides for apps like Phone, iPod, Cydia etc. This stops you from having a whole bunch of apps running in the background when you are trying to do other things, it also frees up a lot of memory for you to use at your disposal
Download the Cydia app, MyOS. You can turn off the Contacts app as its already in your Phone app. Voice control can be turned off to as who really uses it? Multitasking can be switched off to, as it's a large cause of battery drain, sluggishness in iDevices.
Download the Cydia app, Folderenhancer. Turn off folder backgrounds and borders. Cuts out the lag when trying to open up your folders, it's pretty much instant after this.
Download the Cydia app, FakeClockup. And set the phone animations speed to 10x. It gives a lag-free feel to the phone, as everything is so much more faster. It will really shine when you have everything else setup.
I rarely ever use my spotlight search feature, so I used the Cydia app, nospot, to get rid of this. Works really well for iPhone 3G users.
Winterboard themes are a big memory user on your iDevice. I like to keep things somewhat simple when it comes to themes, but if I don't want it on, I take off every theme. No lock screen, no keypad theme or keyboards etc. Cutting back on the themes that have a lot of widgets helps to.
Auto3G is a great app that will save you a lot of battery life if you aren't a power user for texting, or gaming etc. When you shut off your phone, it sets your network to 2G and when you turn your phone back on it sets it to 3G.
Download the tweak from the Insanelyi repo called Daemon Tool. It automatically deletes all the Launch Daemons that are not needed by your iDevice. I recommend this package as it does not require you to SSH into your phone, and is completely automated. Don't worry about your phone, it'll be just fine.