Help with poor performance playing with mods T-T
Yesterday I created a Minecraft 1.21.1 modpack for me and my friends to play, but one of my friends is having performance issues.
I asked her to stream her screen so I could check what was happening. Here's what I noticed:
- RAM usage was around 3GB, even though we allocated 5GB, so I don’t think RAM is the issue
- Without shaders, she gets around 55–60 FPS, but with occasional lag spikes
- When enabling shaders (MakeUp UltraFast), FPS drops to ~23–28 with frequent stutters/freezes (down to 0 FPS for milliseconds)
- GPU usage (F3 menu) sometimes spikes to 100% and then drops again
- GPU temperature stays around 60°C (140°F), which seems normal
What’s confusing is that another friend with an integrated GPU (Ryzen 5 5600G) is running the same modpack + shaders at stable 30+ FPS with no lag.
Specs:
Friend with issues:
- GPU: GTX 1650
- RAM: 8GB (5GB allocated to Minecraft)
- CPU: Unknown
Other friend:
- CPU/GPU: Ryzen 5 5600G (integrated graphics)
- RAM: 16GB (8GB allocated)
We are playing on a server hosted on my PC, and everything is fine on my end.
This makes me think it could be something GPU-related, but I’m not sure what exactly is causing it.
Has anyone experienced something similar or knows what could be the issue?
(Sorry for any mistakes, English is not my first language)
Mods list:
appleskin
appliedenergistics2
architectury
balm
bettercombat
BetterThirdPerson
BiomesOPlenty
chisel
cloth-config
Clumps
combat_roll
constructionwand
corpse
cristellib
crittersandcompanions
cryonicconfig
exposure
FarmersDelight
ferritecore
geckolib
gliders
GlitchCore
guideme
handcrafted
Immersive Vehicles
immersive_armors
invtweaks
iris
Jade
jei
journeymap
lithium
mcw-bridges
medieval_buildings
medieval_buildings_end_edition
Mekanism
MekanismAdditions
MekanismGenerators
MekanismTools
modernfix
mowziesmobs
MTS Official Pack
NaturesCompass
OAmP
oceansdelight
potentials
resourcefullib
simple_weather
sodium
stellaris
TerraBlender
travelersbackpack
twilightforest
t_and_t
variantsandventures
waystones
yet_another_config_lib_v3