[yash101]

The robot will not be in the same place very often. It needs to adapt by itself to it's surroundings. Also, yes, open-loop can be faster, or it can be slower depending on how you tackle it. In the case that I was thinking about, it would take time to read sensors and joysticks, process that information and then move the robot. That would basically have very little impact, unless you are doing complex processing (like vision). So, you are right. The impact of speed would be very little.