inconsistency in native class extension duration

I am working on perfs and spending a lot of time on profiling timelines.
I see very weird inconsistencies in materializing and native class `extending.

This is 2 different app starts with the same exact code. Globally everything is the same except for those "yellow" times.
Here it is a factor 10 which is pretty big.

I add this mostly to start the discussion on what could be the reason for that and how we can make sure we get the smallest one.

• could that be do to profiling?
• @darind do you have an opinion on this?
• here it is in debug, but i see the same kind in production. The difference might be smaller though i am not sure. Can debug/production make a difference for this?

No se nombran archivos fuente, pruebas ni puntos de entrada. Empieza reproduciendo dos inicios de la aplicación con código idéntico en modo debug y producción, comparando las líneas de tiempo del profiling, e investiga si el profiling o el modo de compilación explican la variación observada en la materialización y la extensión de clases nativas. Se considerará terminado cuando se documenten la causa y una forma acordada de medirla o minimizarla.