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?

未指定源文件、测试或入口点。首先，使用完全相同的代码在 debug 和 production 模式下分别复现两次应用启动，同时比较 profiling 时间线，并调查 profiling 或构建模式是否造成了物化和原生类扩展方面的差异。完成标准是记录下原因，以及一种经同意的测量或最小化该差异的方法。