1.20.1 modpack loading incredibly slow, logs show hundreds of the same few errors

reddit removed my last one for no reason, so here's take two.

hi! im currenty throwing together a modpack, and i've actually never run into issues this bad before. It's to the point that the game will load, but it takes almost 20 minutes to even get to the very end of the process, before it progresses to the main menu. The logs have continuous walls of errors and warnings. There is no crash log, because I have not been able to get minecraft to crash, even when making a new world, it just gets stuck! It still happens, even after fixing that more culling /less culling leaves conflict.
https://mclo.gs/O0ZUfOl#L8