Modpack lagging for no apparent reason

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Farmboybello

New Member
Apr 21, 2020
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I am way late to the game on this one but I was replaying Regrowth (one of my all time favourite packs) after a few years and it has been lagging for no apparent reason. About every minute major block lag occurs for about 10 seconds and then everything is fine for another minute.

I tried disabling my texture pack which did nothing and I have also tried installing both optifine and fastcraft, both of which do nothing. I am using less than 50% of allocated RAM and have a GTX 1660 GPU.

I have found nobody else with this issue nor any solutions. Please help!
 
If you are using the FTBApp, you can open the modpack and then there will be an option at the top right to open the folder...

once the folder is opened, then look for the game logs, if I’m not wrong, it’s located in the crash-reports folder, take the most recent one
 
[13:09:46] [Client thread/INFO] [inventorytweaks]: Handling crafting slots.
[13:09:46] [Client thread/INFO] [inventorytweaks]: Merging stacks.
[13:09:46] [Client thread/INFO] [inventorytweaks]: Applying rules.
[13:09:46] [Client thread/INFO] [inventorytweaks]: Locking stacks.
[13:09:46] [Client thread/INFO] [inventorytweaks]: Default sorting.
[13:09:46] [Client thread/INFO] [inventorytweaks]: Sorting done in 7119624ns
[13:09:47] [Client thread/INFO] [inventorytweaks]: net.minecraft.client.gui.inventory.GuiInventory
[13:09:47] [Client thread/INFO] [inventorytweaks]: net.minecraft.inventory.ContainerPlayer
[13:10:04] [Client thread/INFO] [inventorytweaks]: net.minecraft.client.gui.inventory.GuiInventory
[13:10:04] [Client thread/INFO] [inventorytweaks]: net.minecraft.inventory.ContainerPlayer
[13:10:11] [Client thread/INFO] [inventorytweaks]: net.minecraft.client.gui.inventory.GuiInventory
[13:10:11] [Client thread/INFO] [inventorytweaks]: net.minecraft.inventory.ContainerPlayer
[13:10:26] [Client thread/INFO] [inventorytweaks]: net.minecraft.client.gui.inventory.GuiInventory
[13:10:26] [Client thread/INFO] [inventorytweaks]: net.minecraft.inventory.ContainerPlayer
[13:10:34] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 8811ms behind, skipping 176 tick(s)
[13:11:09] [Server thread/WARN] [Waila]: tterrag.wailaplugins.plugins.PluginForestry.getNBTData:327
[13:11:09] [Server thread/WARN] [Waila]: Catched unhandled exception : [class forestry.apiculture.tiles.TileBeehouse] java.lang.NoClassDefFoundError: forestry/core/config/ForestryItem
[13:11:27] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 9843ms behind, skipping 196 tick(s)
[13:11:28] [Client thread/INFO] [inventorytweaks]: net.minecraft.client.gui.inventory.GuiInventory
[13:11:28] [Client thread/INFO] [inventorytweaks]: net.minecraft.inventory.ContainerPlayer
[13:11:57] [Server thread/INFO]: Saving and pausing game...
[13:11:57] [Client thread/INFO] [inventorytweaks]: net.minecraft.client.gui.GuiIngameMenu
[13:11:58] [Server thread/INFO]: Saving chunks for level 'Copy of New World'/Overworld
[13:13:36] [Server thread/INFO]: Saving chunks for level 'Copy of New World'/Nether
[13:13:36] [Server thread/INFO]: Saving chunks for level 'Copy of New World'/The End
[13:13:37] [Server thread/INFO]: Saving chunks for level 'Copy of New World'/Soul Network Dimension
[13:13:38] [Server thread/INFO]: Saving chunks for level 'Copy of New World'/Spirit World
[13:13:39] [Server thread/INFO]: Saving chunks for level 'Copy of New World'/Torment
[13:13:40] [Server thread/INFO]: Saving chunks for level 'Copy of New World'/Mirror
[13:13:41] [Server thread/INFO]: Saving chunks for level 'Copy of New World'/The Outer Lands
[13:13:41] [Server thread/INFO]: Saving chunks for level 'Copy of New World'/Outer Lands
[13:13:41] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 104366ms behind, skipping 2087 tick(s)

The warning pops up as soon as the lag spike ends.
 
Hi,

Based on my past experience playing on my own minecraft servers, these lag issues goes away mostly after i assigned more ram to the server.
E.g. If you have 16gb of ram (and you are running both server and game), 8gb can go to your game, and 6gb can go to your server.

It also does help to close all other applications running in the background when you are running the server and the game (assuming you are running both on 1 machine)... Reason behind this is that the server and game also uses the CPU to do some tasks, hence it will need all the juice it can get out of the CPU.

Try it and let me know if it works for you..

Thanks!
 
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