After I jailbroke my iPad, quite recently actually, I realised that my iPad had become extremely slow. Now I had noticed this a while ago, but I decided to ignore it until I had an important keynote to make and I realised that it had probably become slow due to jailbreaking it. I did some experimenting and realized that jailbreaking it did NOT slow it down. The problem arose because of the SOFTWARE that I used after jailbreaking such as veency, backgrounder, winterboard, etc. On uninstalling these, my iPad blazed back to life!