So, everyone knows that when you fly in creative mode you can go really fast, right? and you also know that when you swim you go extremely slow? well, I tried combining the two and figured out that the water won't slow you down at all!
Steps to Reproduce:
1. Go into creative mode
2. Double tap spacebar to fly
3. Go underwater and fly around
Working as intended. Flying in creative should go fast without hindrance. For example, MC-1444 along with other bugs where fixed to make flying in creative more effective.