[MC-45275] Massive Lag Spikes in 14w04a (VSync Issue)

VSync seems to be the problem. Turning it off fixes the problems I've described below. If you want to help confirm this issue, try turning off VSync if you've been getting this same issue. If you have not been getting this issue, try turning VSync ON and see if it messes up your game.

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Creating a super flat world to test snapshot features greeted me with unusual lag spikes where the screen would freeze and tear when trying to move. Lag spikes happen very frequently around 5 seconds in between on average with up to 30 seconds of the game screen freezing in place and the client becoming unresponsive.

My PC has blue screened at least once, but I was installing new graphics software while testing the game hoping it would resolve the issue and may have put to much strain on my build.(I have confirmed that it was the graphics card update that was crashing my system, not touching Catalyst ever again)

Game physics and events would then need to "catch up" after the delay. For example minecarts would travel in a straight line to rails they would then be on had the game progressed at regular speed jumping off and over other rails in the process.

Zombies groups when attacking a player in survival during a freeze would have the damage and knockback stack up and then be applied all at once afterwards. They once threw me up about 4 block into the air.

Riding a minecart helped reduce the chance of the game freezing, and oddly enough recording my gameplay with a recording software such as Fraps removes freezing occurrences entirely.

I suspect it to be related to a problem with my GPU but it doesn't explain why it only affects this version. I have yet to test the previous snapshots

Related issues

duplicates

MC-45458 Framerate drop/lag in 1.8 for some hardware setups

Attachments

crash-2014-01-20_16.47.41-client.txt

Comments

migrated 2014-01-19T00:25:33Z

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kumasasa 2014-01-19T09:32:29Z

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.

migrated 2014-01-22T21:23:14Z

A crash report has been added.

migrated 2014-01-23T14:20:38Z

May be a duplicate of MC-36883.

migrated 2014-01-23T17:09:54Z

I have the same problem on all the snapshots from 14w02c to 14w04b , the game is normal for the first minute or so then the lag spikes constantly happen around every 5 to ten seconds.
edit: I attached a crash report

migrated 2014-01-24T01:49:37Z

Attached a crash report from version 14w04a as well.

migrated 2014-01-24T17:42:48Z

I have uploaded a world to the following URL: http://www.sendspace.com/file/mkrwx9

teleport to 166 7 45 (apologies, it may be -166 7 45) or possibly any Extreme Hills+ M biome and you will experience the game freezing lag every few seconds.

This world was originally generated by 1.7.4 and has always been used on a dedicated server, the lag affects both the client and the server (as the server complains about losing ticks)

kumasasa 2014-01-24T20:15:35Z

Cannot confirm any lagging with that world. Getting constant 50 FPS and no lag / freeze while moving.

kumasasa 2014-01-24T20:18:04Z

@All having this issue:
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.

migrated 2014-01-24T20:26:27Z

I'll keep adding a crash report for every version still effected by this. It's bizarre how only some computers are effected by this.

kumasasa 2014-01-24T20:56:49Z

Maybe a graphics card / driver issue. Therefore I queried for more crash reports.

kumasasa 2014-01-24T20:59:02Z

@ Aifer Gettisnem:
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.

And: You've reduced the memory for Minecraft, please change it back to 1GB

migrated 2014-01-25T10:52:47Z

This is a crash report for my game in 14w04b

kumasasa 2014-01-25T11:01:22Z

@ izalew zogzog

OpenGL: AMD Radeon HD 6310M GL version 4.1.10834 Compatibility Profile Context, ATI Technologies Inc

Outdated driver, install AMD Catalyst 13.12: http://support.amd.com/en-us/download/mobile?os=Windows%207%20-%2032 or http://support.amd.com/en-us/download/desktop?os=Windows+7+-+32

migrated 2014-01-25T17:04:40Z

Java Realtime Environment has been updated to 7u51 x64. Ram Allocation was set to 256m-512m by default when I created a new profile; changed it back to 1g. Screen freezing has been noticeably reduced but is still present especially while in F3 mode, and client often becomes unresponsive on world selection menu. I'll try upload another crash report.

migrated 2014-02-01T03:36:09Z

As of the latest snapshot I've also noticed that my shift key and scroll wheel stop working at points. May have something to do with the new gamemode.

migrated 2014-02-04T22:31:33Z

Getting that issue too, awkwardly the 1.8 snapshots worked fine before but after I installed 1.7.2. Forge and Liteloader it started derping, I tried running the snapshots with a completely new and untouched MC launcher and .minecraft folder, but i keep getting unbearable lag spikes; constant lag on chunk load and frequent major lag spikes elsewhere even when browsing creative inventory.
Added a crash report; Java is on newest 64bit version, allocated Java memory is 32GB.

thx for all kind of tips 😉

EDIT: Updating graphic card driver resolved the issue; game runs quite smooth now, though some minor lag spikes still appear that dont in 1.7.

migrated 2014-02-08T22:05:23Z

Another crash report for the latest snapshot. Still getting the weird framerate lag. Windows says my Graphics card is up to date. Is there something I'm missing? I would think it would be poor implementation that the developers would make the game unplayable on a system it once could play on.

migrated 2014-02-08T22:50:15Z

Updated my Environment with my Renderer and some other stuff. It should all be up to date unless windows is lying to me.

migrated 2014-02-10T16:38:45Z

I am beginning to wonder whether the issue I'm seeing is the same as what others are reporting.

What I basically experience are lag zones - places in the game where simply being there causes the game to completely freeze up for several seconds, unfreeze for a few, rinse and repeat. I don't get any crashes, the game just locks up and eats CPU cycles like it's trying to process something.

Whenever I'm in a lag zone, it impacts the server too and causes messages like this:
[07:26:33 WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 9710ms behind, skipping 194 tick(s)

migrated 2014-02-13T04:55:50Z

Try recording your gameplay with Fraps or whatever you have if possible. For some reason running Fraps for me clears up any of the lag I'm getting and I want to know if it's the same with others.

migrated 2014-02-14T21:07:29Z

I think I've found the problem. Messing around with my video settings to see if I could get a better frame rate and after turning off VSync it actually makes it pretty stable. No sudden drops in frame rate every second and no screen tearing which is stupid since VSync's job is to prevent screen tearing not cause it...

I'll upload a crash report and a copy of my development console just for the heck of it, but if anyone else is having this problem try turning your VSync off and see if that makes a difference.

I'm not calling this Issue resolved just yet since I don't know if the problem with VSync is bad on my end or if it's the jar handling it wrong. I will update the Issue with this information.