Extremely low 1.7.10 TPS

Hello! I run a small, self-hosted forge server for me and my friends on 1.7.10 as it has some mods we cannot find on other versions. For some reason, the server's TPS deteriorates (Sometimes lower than 1 TPS) after a variable amount of time running and does not recover. Usually with players online, sometimes without. My PC is more than capable of running a server, does anyone have any thoughts?

Specs:
14900K
32GB RAM

Mods:
+unimixins-all-1.7.10-0.1.17.jar
BadMobs-1.0.1-1.7.10.jar
BiomesOPlenty-1.7.10-2.1.0.2308-universal.jar
CarbonConfig-1.7.10-1.2.4.jar
CosmeticArmorReworked-1.7.10-v7.jar
FancyDiscord-1.7.10-1.1.jar
FancyDiscordCore-1.7.10-1.1.jar
inventorypets-1.7.10-1.5.2-universal.jar
LunatriusCore-1.7.10-1.1.2.21-universal.jar
MoreFunQuicksandMod-1.0.8.8fix-1.7.10.jar
mw_2.0-0.4.2.4 (Halloween Update)_mc1.7.10.jar
NaturesCompass-1.7.10-1.3.1.jar
Pam's HarvestCraft 1.7.10Lb.jar
Reliquary-1.7.10-1.2.1.483.jar
spark-1.10.19-forge1710.jar
TubeTransportSystem_1.7.10-0.6.jar
TwilightForest-2.4.3.jar
Waystones_Jawsawn_Fork-mc1.7.10-1.0.0.jar
worldedit-forge-mc1.7.10-6.1.1-dist.jar
YABM2-1.7.10-2.0.4a.jar

Launch command:
java -server -Xmx6G -Dforge.forceNoStencil-true -jar forge-1.7.10-10.13.4.1614-1.7.10-universal.jar

Support would be much appreciated!
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