A verry big lag on every gui menu.

I'm experiencing this too, and it's easily visible from world options menu when hovering mouse over buttons and waiting until they turn blue. This started with 14w02c, 14w02b and earlier versions work fine. I was trying to record the situation with bandicam, but when it's recording minecraft, the problem disappears. The same thing happens every time in the menu, and also with the newer snapshots. The game itself is also unplayable because lag spikes happen every 5 second or so (I guess that's the same issue?).

Video from create new world -> more world options filmed using camera: http://www.youtube.com/audio?v=L6qe_q5mJ9w

From the video you can also see that the first time it takes ~20 sec for the screen to react, the next time it's almost a minute.

There is nothing visible in developer log, and javaw process does not consume any CPU at this time and used memory amount is also stable.

Please attach the complete output of the "Development console" which can be found on the second tab of the launcher.

If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".

Attached also development_console.txt

That does not appear to be the complete output. Make sure you have opened the game, reproduced the bug, then closed the game again when attaching the output.

That was a complete log, I don't have to load any world for the problems to start. Attaching another one (development_console2.txt) that contains also opening a superflat world, exiting it and going back to create world -menu.

Your Java version is out of date! Please update your Java to the latest version (1.7.0_51): http://www.java.com/en/download/.

• When using a 32-bit browser on a 64-bit operating system the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp.

14w02c is outdated. Please use 14w03b.

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.

Updated java: [21:22:05 INFO]: System.getProperty('java.version') == '1.7.0_51'. Same problem continues. Crashed manually version 14w03b in opened superflat world and attaching that.

Update your graphics driver to AMD Catalyst 13.12: http://support.amd.com/en-us/download/desktop?os=Windows+7+-+64

That fixed the problem for me, including the in-game lag spikes. Thank you.

🙂

Thanks that fixed the problem for me too!