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?

Non sono indicati file sorgente, test o punti di ingresso. Inizia riproducendo due avvii dell’app con codice identico in modalità debug e produzione, confrontando le timeline del profiling, e verifica se il profiling o la modalità di build spiegano la variazione nella materializzazione e nell’estensione delle classi native. Il lavoro sarà considerato completato quando saranno documentati la causa e un metodo concordato per misurarla o ridurla al minimo.