Minecraft Forums

I'm having issues playing Minecraft with mods. When I enter a world, I get constant lag spikes (about 1 every second).

Here's all of the mods I have installed.

• Armor Status HUD
• bspkrsCore
• Damage Indicators
• Floating Ruins
• Status Effect HUD
• Battle Towers
• Better Foliage
• Better Sprinting
• Bloodmoon
• Dynamic Lights
• Infernal Mobs
• In Game Mod Configs
• More Enchantments
• Optifine
• PlayerAPI
• Roguelike Dungeons
• Ruins
• Too Many Items
• Vintage Terrain Generator

And before anyone asks, I'm using Forge.

EDIT: My vanilla profile does not have constant lag spikes like my Forge profile.

Bump!

Check your RAM usage, you may have to allocate more RAM to Minecraft. If the RAM usage in MInecraft's debug screen spikes up to 100% when you lag, then that is the issue.

Quote from _Kyle_1»

Check your RAM usage, you may have to allocate more RAM to Minecraft. If the RAM usage in MInecraft's debug screen spikes up to 100% when you lag, then that is the issue.

I checked the debug screen and if the "mem" section is what you're talking about, the RAM usage starts out at 90% and goes to 99% before it spikes then it drops down to 90% after spiking.

I tried setting Minecraft's priority to high in the task manager but that didn't help at all.

So, that's the issue. You need to allocate more RAM to Minecraft. What launcher are you using? If you are using the default launcher, you can follow this tutorial. http://www.minecraftforum.net/forums/support/unmodified-minecraft-client/tutorials-and-faqs/1871637-tutorial-allocate-more-memory-for-minecraft

Quote from _Kyle_1 »

So, that's the issue. You need to allocate more RAM to Minecraft. What launcher are you using? If you are using the default launcher, you can follow this tutorial. http://www.minecraftforum.net/forums/support/unmodified-minecraft-client/tutorials-and-faqs/1871637-tutorial-allocate-more-memory-for-minecraft

When I tried allocating 2GB for Minecraft, I got this error:

Error occurred during initialization of VM
Could not reserve enough space for 2097152KB object heap
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Here's my JVM Arguments:

All I added was "-Xmx2048M -Xms2048M".

Before you ask, I tried removing "-Xms2048M", I checked for typos, and I tried different numbers but I still get errors.

EDIT: I also tried using gigabytes instead of megabytes but that didn't work either.

EDIT 2: Never mind, installing 64bit Java did the trick.

EDIT 3: After allocating 4GB for Minecraft (I have 8GB), Minecraft no longer has any lag spikes and only uses 10-15% of its memory compared to before when it used 90-99% of its allocated memory.

You already have the -Xmx param. Remove -Xmx1G.