Why does running Luxology Modo cause a marked increase in performance for other 3D graphics apps?
MacBook Pros come with dual GPUs (built-in Intel and discrete nVidia) and the OS switch between them in the background, depending on amount of workload. it is likely you went over the graphic intensiveness threshold with Luxology Modo and the OS switched from the low-end Intel GPU to the mid-range nVidia, which benefited other running 3D apps.