Rough investigation: Open-source solver time and memory penalties

[Antti-L]

> The compilation time is a small part of the overall time at present, but it could seem significant e.g. if the goal is to get down to the 1 second ballpark. And since it can be eliminated it should be excluded from any estimate of the achievable performance.

I concur with that.  And after getting there, one could start examining how the performance scales up.