do page load rules evaluate on each page or only specific

hi ,

I have 20 page load rules  . 

My question is do all page load rules execute on each page or only the rule related to that page .

Reason why I am asking is 

when i have condition  path contains and i hardcode the path or URL , in DTM debugger only the page load rule fires shows ,

whereas when i  create a data element where i get value from page title and add condition to rule  data element value =  title ,

there it shows condition not met for all the other pages .

If i understand it correct then when url strings is defined as static it is not evaluating all page load rules ,

WIll evaluating all page load rules based  on data element make the page slow or all rules evaluate anyways .

Thanks