This has been driving me nuts from the beginning... When getting on a ride, the guests run. Getting off they are so slow it really messes with timing when using multiple trains. Has anyone figured out a fix for this yet? If not, this really needs to be in the next big update.
Discussed so many times, search a bit to find previous threads.
Summary is: speed is irrelevant. Balance is the issue. If loading or unloading times or dual stations are used to improve cycle speed, something else must be made worse to rebalance the game. Then we would complain about that. (Otherwise it would be boringly easy to make money; less fun.)
So it's pointless.
However, can you use good mngt to make rides more profitable? Yes you can.
Search for "profitable" or ride profit, or similar; many people have published excellent guides on solving your financial cash flow issues.
Hope this helps, I'm on my mobile so I can't write you a big essay. Good luck!