Css extend impact Extjs application

[wadhahjebri]

Hi,
I'am working with CSS classes and i would like to create my own class css that extend ExtJs css in order to keep ExtJs component properties .
Does this extend may impact my Extjs application performance ?

Thanks.

[alex.volfson]

That is a broad question with many answers based on how one interprets it. The answer is yes, but it really depends how much of your own CSS you add