Iridium

Iridium + Sodium + Lithium vs Sodium + Lithium (1.21.1)

Same scene, same settings. Adding Iridium on top of Sodium + Lithium: +9.7% avg FPS, +4.6% 1% low, +11.7% 0.2% low. The largest gain is on the 0.2% low percentile — the worst frames — meaning Iridium's main contribution is smoothing stutter.