Apache FOP - nested table based layout issue

This is about performance of nested-table based layout
using Apache(0.20.4). 

I generate pdf reports(10-60 pages long) which has
NAME/VALUE pairs and some nested tables (3 level
deep).

This is how I have the page layed out. I have a base
table with 2 columns. Left column contains the NAME
and the right column contains the VALUE. In some
cases, left column has NAME and right column has a
table (nested table 2 level deep). In some cases, I
have table which spans 2 columns. That table can also
be tested.

Hope my little diagram will explain it better.

---------------------------
1. NAME	| VALUE
---------------------------	
2. NAME	| VALUE
---------------------------
3. NAME	|   ---------------
		|
	    ---------------
		|
	    ---------------
---------------------------
4. 
  ----------------------
	   |      |
  ----------------------
	   |      |
  ----------------------
---------------------------	
5. NAME	| VALUE
---------------------------


1,2,5 are NAME/VALUE pairs
3 NAME in first column and table in second column
4 One big table spanning 2 columns


Apache FOP processor seems to take a really long time
(about 30 secs for a 20 page PDF)to render. 
Is this a page design issue or is it Apache processor
unable to deal with nested tables  ?
Dose any one know ? Or can anyone suggest a alternate
solution to my problem ?

Thanks in advance.

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