When you debug from eclipse with more than one android device, you get the \'Android Device Chooser\' dialog box to select with one to deploy the application to. That dialog
First off, do you mean it's slow when debugging, or the phone itself becomes slow, even when not connected? You can try disabling "USB debugging" and then turning it back on again, maybe it just didn't turn on right. You should also make sure that your phone doesn't need any special developer driver to use debug correctly.