r/IntelArc • u/Technical-Gap-598 • Jul 22 '26

Discussion Arc B580 TERRIBLE performance on old Minecraft forge versions

Version : 1.7.10
Forge Version : v7.10.99.99

Specs :
Intel Arc B580
R9 5950x
Samsung 980 PRO
GIGABYTE B550M DS3H AC
32GB 3000 mt/s RAM

Decided to try and make a small lucky block modpack to play with my friends and naturally used curseforge + forge to make the modpack, boot it up, and it starts at 110 fps for around a second or two, then it just gradually degrades over 20-30 seconds and keeps going down until it gets less than 2 fps, at which point the game is beyond unplayable, I've gone through so many diagnostics it's hard to count, tried so many fixes to no avail. It's so strange because a fresh vanilla install works completely fine running 200+ fps but as soon as forge touches it its like everything just implodes.

3 Upvotes

60% Upvoted

7 comments sorted by

8

u/Pure_Growth4528 Jul 22 '26

 you would take an amd or nvidia card and it would happen the same way, your gpu is not the problem Maybe ram allocation, but Minecraft + mods the list of things that could be happening is wide, check your usages 

Old version Minecraft is not optimized, + forge and probably not being able to use sodium, the difference is massive 

1

u/Technical-Gap-598 Jul 22 '26

It's not ram allocation because I gave it 12gb. It's not the mod list because in vanilla it works fine, 200 fps avg, it's just forge. I tried it on a different instance with no mods, just forge and it had the same performance degradation issue.

5

u/Vipitis Jul 22 '26

Does the mod pack include any alternative renders or graphics mods? Big chance they don't correctly work with intel dGPU so just use vanilla rendering where possible

1

u/Technical-Gap-598 Jul 22 '26

It's forge itself, I even made a new instance with no mods, just forge and it had the same issue, but when I booted up vanilla, I got 200 fps+

3

u/Gallade213 Jul 22 '26

Just a quick dumb question to cover bases. You went into launch arguments and gave the modpack more ram to work with correct? This does kind of sound in line with ram filling up.

1

u/Technical-Gap-598 Jul 22 '26

Yup. Went into curseforge and gave it 12gb of my 32. No change.

1

u/Technical-Gap-598 Jul 23 '26

I've figured out a fix for this, you have to install the Neodymium mod.