Issues with DH on Lenovo laptop

Hello there! I have a Lenovo IdeaPad Slim 7 with Intel Iris Xe Graphics, an i5-1135G7, and 8GB of RAM-- yeah, I know it's kinda low in this era, but I cannot upgrade it myself easily and I got this laptop way back in April 2022 without knowing beforehand. :/ I am also on Linux Mint for better overall performance as well as modded Minecraft 1.21.1 with Fabric Aether

Anyways, I was trying out DH ver. 2.3.0-b with the vanilla render disance set to 8 chunks, DH render distance set to 64 chunks, quality set to 'Low', and CPU load set to 'Minimal Impact'. I also allotted 4GB of RAM to my MC with only Firefox open (but I believe closing wouldn't make much of a difference in perf). Right off the bat, with distant generation enabled, I noticed it was ruining my FPS badly, but it was still kinda playable. I didn't count the total FPS as I prefer to play with V-Sync on and the FPS capped to 70. Is this due to the RAM, or simply the CPU load? I'm inclined to believe it's the latter

Another thing I noticed is that when I'm exploring new chunks for DH to render with distant gen enabled, I can still see the vanilla fog, despite clearly disabling it in both DH & Sodium Extra. What's the culprit? These are the mods I use:

BadOptimizations
Better Mount HUD
Better Sodium Video Settings Button
Clean F3
Cloth Config v15
Concurrent Chunk Management Engine
Distant Horizons
EntityCulling
FPS Reducer
Fabric API
FerriteCore
Gamma Utils
ImmediatelyFast
Iris
Litematica
MaLiLib
MidnightLib
Mod Menu
More Culling
Reese's Sodium Options
Shulker Box Tooltip
Sodium
Sodium Extra
Status Effect Bars
The Aether
kennytv's epic force close loading screen mod for Fabric
oωo
uku's Armor HUD
ukulib
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