wipers

Just bought a fully loaded Yukon. Wipers just move slow on the there highest setting. Not what I'm used to. Normally all my other cars go crazy with how fast they move. It's like a Med to maybe med-high speed is all I'm getting. my question is for you is this just normal for this model. Should...

:confused:why both wipers stops working after a few minutes of use? this is in S15 gmc truck it stop suddenly and than after a while starts on its own??? what can be the problem and solution?