I couldn't find it on the forums or on the ultimate uplink guide. If anyone knows the answer please tell me.
Also I'm talking about a passive trace.

I have an iPad 1 and the only time the game slows down a little is when I put the decipher on full power on the fully upgraded trinity gateway. In my opinion you should get an iPad 1 if you only want uplink. It's good enough for most stuff but some people like faster stuff more and want a camera on ...