Quark loaded a new chunk (-7, 11 Dimension: -1) during chunk population, causing cascading worldgen lag. Please report this to the mod's issue tracker. This log can be disabled in the Forge config.

Seed:
5695030614777761475

Mod list:
ActuallyAdditions-1.12-r117.jar
AkashicTome-1.2-9.jar
AppleSkin-mc1.12-1.0.7.jar
appliedenergistics2-rv5-alpha-2.jar
Aroma1997Core-1.12-1.3.0.0.b98.jar
AromaBackup-1.12-2.1.0.0.b71.jar
AutoRegLib-1.3-13.jar
Baubles-1.12-1.5.1.jar
bdlib-1.14.1.6-mc1.12.jar
BetterAdvancements-1.12-0.0.1.8.jar
BetterBuildersWands-1.12-0.11.1.245+69d0d70.jar
BetterFps-1.4.6.jar
BiblioCraft[v2.4.3][MC1.12.0].jar
BiomesOPlenty-1.12-7.0.0.2291-universal.jar
BlockArmor-1.12-2.4.6.jar
blockdrops-1.12-1.3.0.jar
Bookshelf-1.12-2.0.0.415.jar
BrandonsCore-1.12-2.3.1.125-universal.jar
CapabilityProxy-1.12-1.0.0.jar
Chameleon-1.12-4.1.3.jar
ChickenChunks-1.12-2.4.0.70-universal.jar
Chisel-MC1.12-0.0.13.15.jar
chiselsandbits-14.5.jar
CodeChickenLib-1.12-3.1.1.288-universal.jar
CoFHCore-1.12-4.3.3.11-universal.jar
CoFHWorld-1.12-1.0.0.6-universal.jar
ColossalChests-1.12-1.6.5.jar
CommonCapabilities-1.12-1.3.4.jar
Controlling-3.0.2.jar
CookingForBlockheads_1.12-6.3.2.jar
CraftTweaker2-1.12-4.0.2.jar
CTM-MC1.12-0.2.1.5.jar
cucumber[1.12]-1.0.0.jar
Currency-1.12.0-1.2.0.jar
CustomBackgrounds-MC1.12-1.1.1.jar
CustomMainMenu-MC1.12-2.0.6.jar
CyclopsCore-1.12-0.10.12.jar
DarkUtils-1.12-1.6.167.jar
deepresonance-1.12-1.4.9.jar
Draconic-Evolution-1.12-2.3.2.258-universal.jar
ElecCore-1.12-1.8.429.jar
embers-0.221.jar
EnderStorage-1.12-2.4.0.119-universal.jar
environmentaltech-1.12-2.0.0c.jar
extrautils2-1.12-1.5.1.jar
ExtremeReactors-1.12-0.4.5.34.jar
flatcoloredblocks-mc1.12-6.3.jar
foamfix-0.8.0-beta1-1.12-anarchy.jar
forestry_1.12-5.5.0.154.jar
FTBLib-4.0.5.jar
FTBUtilities-4.0.3.jar
funky-locomotion-1.12-alpha-0.0.1.jar
gendustry-1.6.5.4-mc1.12.jar
GoGSkybox 1.1-3.jar
gravestone-1.8.4.jar
gud_clear_jukebox-1.0.0.3.jar
gud_fullscreen_fix-1.0.2.jar
HammerCore-1.12-1.9.3.8.jar
Hwyla-1.8.20-B35_1.12.jar
ikwid-1.0.1.jar
ImmersiveEngineering-0.12-70.jar
immersivepetroleum-1.12-1.1.3.jar
industrialcraft-2-2.8.14-ex112.jar
IntegratedDynamics-1.12-0.8.4.jar
InventoryTweaks-1.63+beta.107.jar
ironchest-1.12-7.0.31.818.jar
jehc-1.12-1.3.0.jar
jei_1.12-4.7.5.84.jar
journeymap-1.12-5.4.9.jar
JustEnoughResources-1.12-0.8.3.23.jar
Mantle-1.12-1.3.1.18.jar
mcjtylib-1.12-2.4.4.jar
MCMultiPart-2.2.2.jar
metamorph-1.1.3-1.12.jar
MobGrindingUtils-0.3.2.jar
moreoverlays-1.12-mc1.12.jar
Morph-o-Tool-1.2-15.jar
Morpheus-1.12-3.3.2.jar
MouseTweaks-2.8-mc1.12.jar
mysticalagriculture[1.12]-1.6.2.jar
Natura-1.12-4.3.0.10.jar
NotEnoughIDs-1.5.4.1.jar
notenoughwands-1.12-1.5.9.jar
OpenEye-1.12-0.8.jar
OptiFine_1.12_HD_U_C4.jar.disabled
OreExcavation-1.4.100.jar
Pam's HarvestCraft 1.12c.jar
plustic-6.0.0.5.jar
Psi-r1.1-52.jar
Quark-r1.2-104.jar
QuickLeafDecay-MC1.12-1.2.3.jar
rangedpumps-0.5.jar
RebornCore-1.12-3.2.5.88-universal.jar
RedstoneArsenal-1.12-2.3.3.11-universal.jar
RedstoneFlux-1.12-2.0.1.2-universal.jar
refinedstorage-1.5.14.jar
refinedstorageaddons-0.1.1.jar
ResourceLoader-MC1.12-1.5.2.jar
rftools-1.12-6.12.jar
rftoolsctrl-1.12-1.6.8.jar
rftoolsdim-1.12-5.04.jar
roots-2-0.025.jar
SolarFluxReborn_1.12-3.25r.jar
SoulShards-TOW-1.12-2.7.3-52.jar
SoundFilters-0.10_for_1.12.jar
StevesCarts-1.12-2.4.6.36.jar
StorageDrawers-1.12-5.2.9.jar
StorageDrawersExtras-1.12-3.1.0.jar
StuffASockInIt-1.12-1.1.11.jar.disabled
Tails-1.12-1.10.0.jar
TConstruct-1.12-2.7.2.15.jar
The Beneath-1.12-1.2.0.jar
theoneprobe-1.12-1.4.15.jar
ThermalDynamics-1.12-2.3.3.10-universal.jar
ThermalExpansion-1.12-5.3.3.15-universal.jar
ThermalFoundation-1.12-2.3.3.10-universal.jar
TinkerToolLeveling-1.12-1.0.2.jar
tinyprogressions-1.12-3.2.3.jar
TIS-3D-MC1.12-1.2.2.4.jar
TTFR-1.12-1.8.0.jar
valkyrielib-1.12-2.0.0c.jar
WailaHarvestability-mc1.12-1.1.11.jar
Wawla-1.12-2.5.239.jar
xnet-1.12-1.3.5.jar
Xtones-1.12-1.0.4-7.jar
zerocore-1.12-0.1.0.9.jar

See #412

I did as the logs instructed. I figured that they would have added that console spam so I reported.

I am having this issue too, I think it might have to do with recurrent complex. I was going to start a new issue about it, but it seems like a common issue here, so i won't bother on this side too much. I will report this to RC's side then. Also, when the world generated, the screen turned black and I couldn't even go to task manager at that point, so it basically crashed my computer :/

Am also having this issue, but it's not as annoying as not exiting the bed... lol

[16:36:53] [Server thread/WARN] [FML]: Quark loaded a new chunk (-36, -100 Dimension: 0) during chunk population, causing cascading worldgen lag.
[16:40:28] [Server thread/WARN] [FML]: Quark loaded a new chunk (-38, -103 Dimension: 0) during chunk population, causing cascading worldgen lag.

Full error reports:
https://filebin.net/ij6kamnswudrppgw

Seems like this is not over yet, I get this on Quark 109:

[21:22:23] [Server thread/WARN] [FML]: Quark loaded a new chunk (-105, 105 Dimension: 0) during chunk population, causing cascading worldgen lag. Please report this to the mod's issue tracker. This log can be disabled in the Forge config.
[21:22:57] [Server thread/WARN] [FML]: Quark loaded a new chunk (-130, 137 Dimension: 0) during chunk population, causing cascading worldgen lag. Please report this to the mod's issue tracker. This log can be disabled in the Forge config.

On the 2 locations, there where Quarks Dungeons, like this one: