Since 15w39b I have extreme block lagg, if I try to use/break/place blocks it has a delay of 4 seconds.If I open a door it looks closed, but I can still walk through it.
Affects snapshots 15w39b and 15w39c
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MC-89302 says it's fixed in 15w39c.
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]
) to this ticket.
Please attach the complete output of the "Game Output (Your Minecraft name) " which can be found on the fourth tab of the launcher to this ticket.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".

So I have to attach game output AND crash report.
I will do it as fast as I can.

This may be the same bug I reported yesterday, it isnt block lag but the game doesnt render the door as open or blocks as mined immediately. MC-89355

Well, then both are duplicates of MC-89262
I'm having the same problem. 15w39c.