- 3X speed-up in ray tracing shading calculations
- higher quality fur and particles for less computation
- improved statistics for shader profiling
- brick maps as geometry
- approximate occlusion and color bleeding
- multi-threading allowing
- revamped plug-in interface
- a whole range of general systems optimizations offer dramatic reductions in memory usage including 4X in Langrangian filtered texture performance.
https://renderman.pixar.com/products/ne ... lease.html