Lag on snapshot 14w02c

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".

I have added a log called 14w02cDevConsole.txt in which my sister and I experienced lag (sun jumping backwards, blocks popping back then finally breaking, etc.) trying to play multiplayer Minecraft via LAN. I have played with 14w02c on my 1.7.4-created world and had no problems with lag. I will create a new world in singleplayer and see if I can replicate this lag in singleplayer.

I have managed to semi-replicate the lag in SP, except it is just with FPS lag/freezes when in an environment with lots of trees, etc. When I went into an extreme hills biome, it stopped. Can provide a developer's console log if needed.

Might be related to MC-44531?

This is for a world seed: 9108691203762882539

I've ran around a bit and given the world time to load. Usually you have to break blocks 2 or 3 times before they stay broken, though its pretty random. For sure punching a tree right at the spawn in demonstrates severe lag.

GL fixing this. I look forward to new snapshots )

I think the relevant lines are:

[13:08:28 INFO]: Client> [13:08:28] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 20311ms behind, skipping 406 tick(s)
[13:09:27 INFO]: Client> [13:09:27] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 4167ms behind, skipping 83 tick(s)

Not sure what it could be this is just a brand new world.

I've got a clean install of the latest 64 bit JRE. And up-to-date system. Also like to put out that I'm running win7 64bit on an AMD Athlon II X4 630 2.8Ghz (4 cores).

*update, re-created a new world with 14w03b (same seed), still has block lag, but its only about 3 seconds now and eventually the blocks break without having to break them multiple times. So vastly improved but still there.

Not sure if this is related to MC-45154, but I'm experiencing lag spikes every 5 sec (from 30 to 0/1 fps), and also the menus are really slow, especially world options menu.

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 with crash report from the seed I posted about before.

I also took the time to look at the sun, and it shows the laggy bounce behavior the OP talks about.

Thanks for looking into this, will check back again if you need further assistance )

*Update:

I did some further testing and created a new world seed: 4385339764498312452

This world spawns on a small island in an ocean biome without the lag, game seems normal.

The laggy seed: 9108691203762882539 spawns bordering tiagahills and plains.

I tried turning creative and peaceful on and off and that didn't seem to affect the lag. I start my worlds in hard by default. Opening to lan did not fix as well.

Graphics drivers didn't change, and I'm fairly certain this has nothing to do with GPU lag. FPS seems consistent with snapshots when I mouse look.

Just another update, I did some further testing in seed: 9108691203762882539 . It seems flying into the plains or tiaghills biome away from spawn 100 blocks or more seems to remove the lag entirely.

Just over a hill is a mega tiaga biome and I flew quite a ways into it. To about x: -120, y: 94, z: 259 where the lag remains.

The lag seems fine at x: 266, y: 66, z: 54 in a small village by the plains and regular tiagahills (game is normal).

Would say the lag is some how related to mega tiaga biome in that seed.

Just deleted %appdata%/.minecraft and reinstalled from scratch using all the default settings. Updated the launcher to use the latest snapshot versions.

I still get the jumpy sun (sun bounces up and down if your put your cross hair next to edge and block lag (blocks break, pop back instantly takes 3-4 seconds for block to break).

Seed: 9108691203762882539 (previous buggy seed in other comments).

I'm curious if anyone else can replicate this issue with this seed.

The lag seems to dissipate after about 5 minutes after creating a world on the latest snapshot, 14w05b. Would say... resolved?

/time set 0 does not re-create the lagging conditions again.

I would only say half-resolved really. I discovered upon the creation/opening of new worlds, there is massive lag until it has all its ducks in a row then it seems pretty happy. Still annoying though.

I can say I was not having this problem earlier when playing on LAN Minecraft with my sister and appears to have started right as my internet connection got bad. It tends to go up and down due to it being a pure wireless connection that takes interference regularly. I highly doubt they're related but just noting it

Yeah, I understand your sentiment, just hoping things will iron out with the snapshots more myself. For reference I am using single player created worlds. No LAN play or server aside from the one built into the client.

My best guess is something got borked or a lot of behind the scenes debugging or disk OI issues. Or the server thread is being throttled somehow.

Is this still a concern in the current Minecraft version 14w21b or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

If I generate a new world with specific seed: 9108691203762882539 it lags for quite awhile, however on most worlds generated randomly it doesn't lag. The lag does resolve itself over time. Tested for about 5 minutes and still pretty laggy. Lag is still apparent at spawn in.

That's with 14w21b.

Here's a forced crash from 1421b during the lag at spawn. Chopping spruce blocks.

Works great, just tested it!!!!!!! Awesome! New engine updates in snapshot are pretty snappy 🙂