After replacing a kitchen sink faucet, the hot water pressure dropped and it takes the kitchen faucet a longer time to get hot water?

Sounds like you dislodged some crud and it's been drawn up into your faucet. Shut the water off and open up the valve. Check and clean the inlet ports on the cartridge.
Before you button up turn the water back on for a few seconds to flush out the supplies and open valve body. Good luck. Tom