RoboBridge uses a very sophisticated algoritm to calculate what card it should play. Each card needs millions of calculations.
Especially the first tricks generate a high load on your computer's processor.
The faster the (multi-core) processor in your computer is, the higher RoboBridge's level of play will be.
Default RoboBridge maximizes its think time to 15 seconds per card. If you feel 15 seconds is too slow, customize this setting to a number of seconds you are comfortable with.