No, it should work. Did you retry it? Did you completely reset your device and retry it? Are you sure the jailbreak is still installed? (That slowness you report is _not_ what I'm asking for here! Rather you should check by trying to install some simple hack, e.g. launchpad, which would not work if the jailbreak is not installed anymore.)
However, there is no way that a slow down would be the result from the jailbreak. As it works, it does not leave anything running.
My guess is on side-effects by some other thing on your Kindle - or leftovers from another hack that make the jailbreak malfunction.
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