Run time in seconds to generate a random genealogy for a sample of a certain size for different sampling rates.

The execution time is shown split into the time demand for the forward run and the one for the backward run only. We simulated 16 = 42 haplotypes and no host immunity. The recovery rate is ρ = 1.0 − ζ, with ζ the sampling rate, while the transmission rate is λ = 2.5 for all 16 haplotypes. The tests were run on a server node with an Intel Xeon Gold 6152 2.1–3.7 GHz processor and 1536GB of memory.