Fancy Nature replaces flat leaf cubes with multi-layered 3D geometry. Big forests, jungles, and dark oak woods therefore give your computer more to draw. If your FPS drops when you walk into thick woods, try these steps.
Use a rendering optimizer
The pack works alongside rendering optimization mods like Sodium and keeps lighting smooth. If you play on a mod loader that supports Sodium, installing it is usually the biggest single improvement. Keep Fancy Nature enabled in Options → Resource Packs as normal. Sodium doesn't change how the pack is selected.
Tune the pack and your settings
1. Switch to a lighter leaf variant. Change from Dense to Patchy or Thin in the Resource Packs menu. Fewer leaf layers means less to render.
2. Try Branchless models. Removing the inner branch geometry gives a cleaner look and trims a little detail inside every leaf block.
3. Lower render distance. In Options → Video Settings, reduce Render Distance a few steps. This cuts down how many distant tree canopies are drawn at once.
4. Test in the worst spot. Fly over a jungle, dark oak forest, or mangrove swamp after each change. Those biomes have the most leaves, so they show whether the change helped.
Adjust one thing at a time so you know which setting made the difference.