Significant FPS drop when looking at leaves

Summary:
When looking at a lot of leaves, the frame rate drops significantly. I believe this is an issue with Render Dragon because I only started experiencing it when Render Dragon was implemented. Before Render Dragon was implemented, leaves had very little effect on frame rate.

Steps to Reproduce:

1. Create a new world
2. Locate a forest biome
3. Look at the trees
4. Observe the frame rate

Observed Results:
The frame rate drops significantly.

Expected Results:
The frame rate should be the same as it was before Render Dragon was implemented.

Screenshots:
Here is an old screenshot taken in 1.16.0.66 Beta:

Here is a screenshot taken in 1.17.20.21 Beta at the same location:

Notes:
When testing this, you may experience MCPE-122873, so I would recommend setting gfx_vsync to 0 in options.txt to make sure you don't experience that bug.

System Specs:

• AMD A8-6410 APU with Radeon R5 Graphics
• 8GB RAM