Execution order of objects into a Portal page

Hi, to all.
I have a portal page (Oracle Portal 10.1.4) with many Areas (Items and Portlets). Every area contains one or more components (java portlet, plsql portlet,
dynamic page, plsql item, html portlet and so on). Let say 5 areas and 10 objects.
What is the order of executions of the objects ?
Who is the first object executed?
Portal executed all the objects in the first area and then started with the second area?
Which is the first area? these at the top-left corner of the page?
Thank.

8.3.1 Managed Portlet Execution per Page
The PPE(Paralel Page Engine) uses the concept of fetcher threads. These are threads within the PPE servlet which are used to service requests for portlet content. By default there are 25 fetcher threads within the PPE waiting to service requests. If a page has 26 portlets and that page is requested then 25 of the portlets will be requested in parallel and the 26th request will wait for the next available fetcher thread.
This serialization effect will ultimately slow down the portal performance as more requests are received. This degradation will affect the whole portal site, to combat this at a more granular page level OracleAS Portal introduces a feature called Managed Portlet Execution (MPE).
This feature provides a throttle effect similar to fetcher threads but on a per-page basis. If a page has 25 portlets 20 will run the other 5 will wait for free slots then they will run, in effect they'll be throttled.
MPE is set to 20 by default, but this is a configurable parameter allowing administrators to ensure that the performance of the whole site is not degraded by over-zealous page designers putting excessive quantities of portlets on one page.
Link:[http://www.deakin.edu.au/its/dba/oracle-doco/9.0.4.1/9.0.4_doc_library/core.904/b12223/portal.htm#CIHHFCGE]
And parallel means like "all at the sime time" isn't it?
Greetings

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