why is manual faster than auto ?

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Ok my questions is why does a well-driven manual car accelerate better than the equivilant auto ?

My understanding is that with a manual the clutch disc has to be separated then repositioned on the flywheel at every gear change, but with an automatic car, the torque converter means the drive train is always connected to the engine.

So shouldn't this result in better acceleration for auto car ?
Or is the fluid inside torque converters not very efficient in transferring the spinning motion ?

I'm trying to learn about technical aspects of cars so any help would be appreciated