On call of startCapture or checkConnectedPad driver performs automatic pad search on USB ports before taking other actions. It works the following way: driver opens all USB ports and tries to get pad type connected to the port. If configured pad is found, then driver corrects pad settings in accordance with search results and continues execution.
To speed up searching, it's possible to disable pad search for startCapture function. This can be done by setting checkPad parameter of startCapture to False.