Description:
------------
When running a portion of script which fills an array with 
objects, it is easy to notice a significant slowness depending 
on what has already run before in the script., even if that 
"pre-processing" is totally independant . The more load that 
runs before, the slower the filling will be... 
 
Under 4.3.6 almost no differences between : 
- a "just filling" script 
- a big load followed by a "filling" part 
 
Both 4.3.6 and 5.0.0 RC3 compiled from source. 
 

Reproduce code:
---------------
$big_load = new BigLoad ;
$big_load->go() ;
unset( $big_load ) ;

/*  Filling start */

$arr_obj_orders = array() ;
foreach( $arr_no_order as $no_order )
{
   $obj_order = new Order ;
   $obj_order->load( $no_order ) ;

   // to show filling avancement
   echo $no_order ;

   $arr_obj_orders[$no_order] = $obj_order ;
}

/* Filling end */

Expected result:
----------------
The expected behavior is of course no slowness with the 
"filling" part of the script, ie the same behavior as if there was 
no big load before the filling part.