I'm running Minecraft on the following machine: Windows 8 x64, 8 GB RAM (4 allocated for Minecraft), i5-2500K @ 4.5Ghz, AMD Radeon R9 290.

I've got about 70 mods including Buildcraft, Thermal Expansion, and some other common technology mods. I haven't had this issue in earlier versions of Minecraft. As for Forge, I'm using 1226 (one of the latest builds).


Like you can see, a lot of irregular spikes and very high tick times. Moreover, in Debug view I get every now and again a message that something is taking too long and "root" or "root.tick" or "root.render" or others took approx. 110ms.

Now as I'm curious I tested the same on a machine that is set up exactly the same but running on an Intel Celeron (2-cores) @ 3.2 GHz and with an Nvidia Geforce GTX 560 Ti.

The game runs perfectly smooth with all mods. The ticks are short and equal and I get an average of 60 FPS with Mods and highest viewing distance. Here take a look, the same world just on the other machine: Testing machine



I recently had a problem that randomly the menu's lagged and audio glitches (CPU frozen) occurred in Thief. Since that time I went down with the clock, though a lot of intense burn-ins said it would be stable. Now, these glitches didn't appear anymore, but I can't believe that Minecraft stresses the CPU so much that it's getting unstable... Moreover, I tried Terasology (maximum graphics settings) when the clock was still higher. It ran with a smooth 60 FPS and without issues. I tried it again a few days later and then it lagged the same as Minecraft did, just that Terasology sooner or later crashed with a "somewhat Delay" exception. I guess the same issue — unstable ticks.


closed as off-topic by Gigazelle, Ivo Coumans, Joachim, Dragonrage, Virusbomb Aug 5 at 17:48


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    I'm voting to close this question because tech support for modded Minecraft is off-topic here. – Gigazelle Aug 4 at 21:04
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    @Gigazelle As far as I understand it, that close reason is meant for crash support of modded minecraft rather than all tech support, see here for reference. (there are some hidden comments that are important, too, and this only uses Robotnik as a reference, so I may still be wrong, or misunderstand it even after asking). Note that this reference is about the comments rather than the answer itself – bearb001 Aug 4 at 21:50
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    In context of this question, there are 70+ mods installed, and there is no issue in vanilla Minecraft. The meta thread discussing modded Minecraft support (gaming.meta.stackexchange.com/questions/10390/…) includes not only crashes, but issues as well. While not all questions for modded Minecraft are off-topic, this one in my opinion most definitely is. – Gigazelle Aug 5 at 5:36

Lag spikes are caused by three possible things:


  • Too many packets!




  • Wait. I'm still writing...


  • Inefficient coding, AKA. Bugs



  1. Revert to the low-resolution textures
  2. Lower your audio and video settings
  3. Close ALL other tasks other than Minecraft.

because it most likely because your computer can't handle it.





