How breaking MVC pattern is affecting performance

[hakeryk2]

Hi folks,

I am wondering if using in .tpl files code that will break mvc rules, something like this 

<strong>{Product::getProductCategories($product->id|intval)}</strong>

instead of proper method like passing those values into smarty variable is affecting performance?
 

[bellini13]

Its not so much a performance issue, its just poor programming to use PHP directly inside of a smarty template.  In fact, using PHP inside of smarty is likely disabled.