[Mono-aspnet-list] What happens before preinit?

[APS]

Hi,

I'm tuning my webapp and on heavy server loads I've a small delay 
that I'm not able to understand.
My web pages inherits from a custom class that inherits from 
web.page. When I look at the trace I see a log that I placed inside 
AddParsedSubObject and after a couple of seconds I see
aspx.page Begin PreInit
I'm not able to find out what happens between the two logs, you can 
suggest me something to do? I altready placed traces inside about 
every OnMethod of my class but most of the logs are after aspx.page 
Begin PreInit.

Some hint? Please help.