Does get_template_part() content gets parsed if it's not executed?

Question

My page templates are currently built up as shown in first example but I really don't like that half of the template is just sitting there, not being used and takes the server resources for no good reason.

Does everything in both examples gets parsed by server, emphasis on get_template_part()?

---

<?php

//Page template

if( $something ) {

    // 1000 lines of code
}
else if( $something_else ) {

    // 1000 lines of code
}

?>

---

versus

---

<?php

// Page template

if( $something ) {

    // Template with 1000 lines of code
    get_template_part( 'lib/template', 'option-a' );
}
else if( $something_else ) {

    // Template with 1000 lines of code
    get_template_part( 'lib/template', 'option-b' );
}

?>

Answer 1

Only if $something or $something_else are true, otherwise the code will jump to the next argument.