When you go in the new oceans biomes (warm ocean, lukewarm ocean, cold ocean and frozen ocean and especially their deep deviation) the game will crash little by little especially when you are deep (underwater faults) and it's very annoying.
How to reproduce
1.Swim in an ocean
2.Going deep in ocean
3.The game will crash and will recover and so
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Thank you for your report!
However, this issue has been temporarily closed as a Awaiting Response.
We do not have enough information to find the cause of this issue.
In case of a crash please add the file [.minecraft/launcher_log.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
to this ticket.
If there is no crash log, please follow that guide.
Once attached, the report will be reopened automatically.
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There is no crash in the logfile, only lag
warn Can't keep up! Did the system time change, or is the server overloaded? Running 5392ms behind, skipping 107 tick(s)
Did you mean that ?
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.

You're running out of memory:
Memory: 172308384 bytes (164 MB) / 1073741824 bytes (1024 MB) up to 1073741824 bytes (1024 MB)
Assign more RAM to the Java Virtual Machine.
Launcher -> Profile Editor -> Edit Profile -> JVM Arguments -> Change -Xmx1G to -Xmx2G (or higher)

In fact, this is a duplicate of MC-129492