Hi,

for my app's backend I have written a custom method to draw a select
widget which was consuming a lot of memory to generate.

The default form generated a select widget from the model populating
full objects just to render an options list which only needs a PK and
a string, so I wrote a method which generates a new sfWidgetFormChoice
and fills it with choices from a custom query which retrieves only 3
columns, the PK and other 2 to compose the option name.

The memory consumption is now 20M less than the original, but the time
it takes to generate the page has increased from 600ms to more than 3
seconds. The time profiler in the debugbar shows that all this extra
time happens on the rendering of the form.

I can't understand this behaviour because the sfWidgetFormPropelChoice
extends sfWidgetFormChoice, so the rendering is the same, the only
difference is the way in with the $choices array is generated

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