WordPress defer parsing of javascript.

wp-defer-scripts.php

<?php 

//defer everything but jQuery
function vtl_defer_scripts( $tag, $handle ) {

    if ( 'jquery' == $handle )
        return $tag;

    return str_replace( ' src', ' defer src', $tag );
}

if (!is_admin()) {
    add_filter( 'script_loader_tag', 'vtl_defer_scripts', 10, 2 );
}

//you can defer jquery too but you need to get tricky with gravity forms

//defer everything 
function vtl_defer_scripts( $tag, $handle ) {

    return str_replace( ' src', ' defer src', $tag );
}

if (!is_admin()) {
    add_filter( 'script_loader_tag', 'vtl_defer_scripts', 10, 2 );
}

//now we need to make sure Gravity Forms scripts aren't instantiated before 
//jQuery

//move Gforms scripts to the footer
add_filter( 'gform_init_scripts_footer', '__return_true' );

//now we're going to wrap the inline scripts in DOMContentLoaded event listeners
//to ensure they aren't triggered before jQuery loads.
add_filter( 'gform_cdata_open', 'wrap_gform_cdata_open' );
function wrap_gform_cdata_open( $content = '' ) {
    $content = 'document.addEventListener( "DOMContentLoaded", function() { ';
    return $content;
}
add_filter( 'gform_cdata_close', 'wrap_gform_cdata_close' );
function wrap_gform_cdata_close( $content = '' ) {
    $content = ' }, false );';
    return $content;
}

?>