I thought that in order to drive in the carpool lane you needed to have at least one passenger.
California has -- for more than a decade -- issued carpool lane stickers to owners of electric and hybrid vehicles (e.g., Tesla, Prius, etc.). Those stickers allow the driver of the vehicle to drive in the carpool/HOV lane without a passenger.
Have a Tesla with HOV stickers. And it just picks up speed even before you can notice it.
Before
you notice it. I know several people with Teslas who don't have this problem. If you're unable to operate the vehicle within the boundaries of the law, you may want to take some remedial driver training. If you think the issue is the car, you might want to take it for service.