Kodopium

Kodopium is a optimization modpack like Simply Optimized but better it works the best on low-end devices/mid devices and i am going to test it on more hardware soon to be 100% sure it works for everyone! and yeah this modpack is kinda really just like Simply Optimized yeah 100% based off it so credits to them for giving me this idea and yeah i will reccomand to play it with these settings for the best fps

<Render distance: 8>
(all the other 2 options below render distance on the lowest)
<V-Sync: OFF>

<Chunk Update Threads: 16 threads>
(WARNING: CUT might have a different number of T and if that is the case just put it on the max)
<CPU Render ahead limit 9 frame(s)>
(WARNING: RAL might have a different number of F(S) and if that is the case just put it on the max)
<FOV: Quake Pro>
<mipmap levels: 0x>
cullleaves/smartleaves (TURN ON)>

WARNINGS

for me it said i dont have the game installed/fabric installed idk why but if it doenst work use this link: https://fabricmc.net/use/installer/
and select 1.21 at the version then click install and then go to minecraft and if it is selected with the fabric icon and it says fabric installer or smt like that search for the modpack and then launch the modpack and it should work and idk if this is an issue with my pc or an issue with minecraft or an issue with my modpack but if it doenst work this could fix it and if it doenst work idk just ask ai tbh or someone that knos OpenJDK/java 17 better also another fix could be with this program: https://www.java.com/en/ and it is OpenJDK/java and if none of these work and ur game doenst work i honesly should say call the minecraft support i forgot the link or if it even had a link but call someone that knows OpenJDK/java 17 or stuff yeah anyways.

USED LINKS

fabric: https://fabricmc.net/use/installer/
openJDK: https://www.java.com/en/