My BB 9900 fell off my cars roof while i was driving and screen completely shattered but as soon as i put the battery in...

Ok what you going to do is when turing the ps on keep in the power button till you hear 2 beeps and that sould probably open in safe mode then plug in you remote * Do not know if you tried that ?

Buy a new tablet Sorry for your loss :(

The best thing to do to make any device faster is to format and you can also look at to root your tablet , keep in mind there is risks to rooting an device ! Hope i helped