The bug

Multicolored beacon beams can cause a heavy FPS decrease compared to non-colored or single-colored beams. This can be an issue when a large amount of multicolored beacons are placed around for decoration purposes or other reasons.

How to reproduce

1. Place a 3x3 of beacons on a pyramid
2. Place around 12-24 or more stained glass/panes with different colors per beacon beam
3. Notice the frame rate, results might differ on hardware