Is fixed with the new snapshot 15w39c
I have a block lag problem. I started a survival world on 15w38a and everything was fine. But since i upgraded to 15w38b i have a block lag,in survival i need to break a block 2 or 3 times and in creative a block has a break delay of 4 seconds this is also a problem in 15w39a and 15w39b.
when i wrote this 15w39b is the newest version. I tried to set the video settings to minimal but it doesn't work, I used to play Mc normal. I also play modded survival with 40 mods and i have no problems. My FPS is 40
in attachment is the game output and the crash report when you press F3+C
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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]
) 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".

Does your issue still occur in 15w39c?

It's fixed with 15w39c

Sorry, but on my computer this problem not be fixed with 15w39c! Moreover, I have reduced the FPS from 45 to 18!

Влад Донец: You're looking for MC-89262.