In the example of Figure 1, results were computed in 786s for finite elements, 0.8s for plane-wave model and 1.2s
for the new ray-based model. In the example of Figure 2, they were computed in 1320s, 0.8s and 4.7s respectively.
The increase in computational cost of the new model compared to the plane-wave approximation is therefore limited.
Besides, these times were obtained with a preliminary implementation of the model and are expected to be reduced
by further optimizations.