LODs take 10–15 minutes to load and never fully reach normal quality

When I load my singleplayer world, LODs and chunks load extremely slowly. It takes about 10–15 minutes for them to reach a somewhat acceptable quality — and even then, they never fully load to what they should look like. Distant terrain always stays slightly blurry and low-detail. This makes the game frustrating to play, especially when re-entering the world multiple times.

System specs:

CPU: Ryzen 5 7600X

RAM: 16GB DDR5 (6.2GB allocated to Minecraft)

GPU: RX 580 2048SP

Storage: Old HDD (not SSD)

Minecraft version: 1.21.11

Voxy version: 0.2.11-alpha

Using AMD patch: https://github.com/1MarcosDev/AMD-Patch-for-Voxy

Expected behavior:
LODs should load to full quality within a reasonable time (seconds, not minutes).

Actual behavior:
LODs load at an incredibly slow rate. The world looks bad for the first 10–15 minutes of gameplay, and never looks perfect even after that. The AMD patch fixes crashes and rendering issues but does NOT improve LOD loading speed. I suspect the old HDD might be a bottleneck, but 10–15 minutes still seems excessive.

No source file, test, or entry point is identified. Start by reproducing the issue with the listed Voxy, Minecraft, AMD-patch, hardware, and HDD setup, then compare loading behavior and logs with the world on faster storage. Done means identifying the bottleneck and verifying that LODs reach their intended quality without the reported delay.