Game display freezes for 1-2 seconds and then resumes normal play. Increasing amount of Java max heap from 1G to 2G or 3G does not appear to have any effect.
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[media][media]

Please attach the complete output of the "Game Output (Your Minecraft name) " which can be found on the fourth tab of the launcher.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".

Game output from the launcher.

That's lag.