All things are lagging (due to mob spawning, when you do "/gamerule doMobSpawning false", then lag is gone, but I need mobs) at singleplayer world (redstone, animals are floating, block placing sound lag, etc.)
This problem started at Minecraft 14w25.
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Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt
) here.

Added.

Does this happen in any world (a newly generated world)? What are your video settings (fast/fancy graphics, view distance, etc)? And does this occur when turning off VBOs?

Try to add more RAM (1G instead of 512M), other than that, your system does not meet the minimum system requirements. You can see those here.

@CubeTheThird Any world. Video settings: Fast, Render distance: 4 chunks, Smooth lightning: off, Max framerate: unlimited, VSync: off, Mipmap levels: off, clouds off. And this happens when VBOs is disabled, too.
@Galaxy_2Alex It worked before 14w25 snapshot perfectly, why not now..? And I added more ram, but the game even not using it.. Also it didn't reduced CPU usage.

Found an "temporary fix" to this problem - do /gamerule doMobSpawning false
Maybe is issue with mobspawning..?

I have the same issue and had the same response from [Mod] Galaxy_2Alex. And same here game was fine before, now it's not. Minimum/recommended requirements didn't change. I guess you don't realize that people with quad core / i3 / i5 CPU's have same problems. Will you tell them their computers don't meet minimum system requirements?

Re-opening and changing title.