I have strong water pressure in all my facets except the hot water in the bathtub. How can I make the water run out faster?

If hot water is everywhere but the tub it is likely your tub faucet mixing valve plugged with debris or scale. Shut off the main, remove the handle and bezel. You should see a hex that holds the valve, remove it and the valve: clean it or replace it. While the valve is removed have a friend briefly turn on the main while you hold a rag over the opening, you may be wet. Mention earlier today by a very good plumber, a good idea to cover the drain in case you drop a nut or anything. If you have good pressure when the main was briefly opened it is your valve.

Is it a newer home? Many of the newer tub and shower faucets have smaller ports now.