I've been slapping and popping for awhile now, but want to improve my speed. Any tips?

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Just keep practicing at a speed you're comfortable with, and gradually speed up. There is no other way I'm afraid. Learning other peoples songs is a good thing to do, cos the speed of the origonal gives you something to aim for.
learn how to double slap
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i would just say practice alot

i can only slap down not back up any suggestions?
Buy "Slap It" probably the only book you'll ever need to improve your slap/pop technique. I'm still working through it, but even being only as far as I am (not too far) has improved my slap a lot.