When you're in the water, a drop of FPS is observed (in my case I went from 25 FPS to the surface, then I found a 1-5 FPS in water)
sure forgive me for the mistakes of grammar, I do not speak English fluently
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Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
) here.

See the comments about particles in MC-58057 . Can you confirm this ?

I comfirm
My normal fps: 30
Underwater: 3