Robot driving speed - help

When our robot is driving with one cube or without anything it is incredibly fast. But when carrying 2 cubes it becomes exponentially slower.
What could be causing this

Well, maybe your gear ratio for your drivechain isn’t giving you enough torque. It means that your robot would go very fast, but unable to carry too much stuff.

Weight distribution. Or more specifically the weight changing relative to the driven wheels.

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When you grab cubes as the weight goes onto the robot it is putting a lot of stress on your motor and could be overheating them you may need to check if there overheating and add more wheels to disubrit the weight on less motors.