Maybe load jQuery from the google cdn

wp-jquery.php

add_action( 'init', 'maybe_load_jquery_from_google', 1 );
function maybe_load_jquery_from_google() {

	// do not load in wp-admin
	if( is_admin() )
		return;
	
	// Load from SSL if necessary
	$protocol = is_ssl() ? 'https:' : 'http:';
	$url = $protocol . '//ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js';
	$version = '1.8.1';
	
	if ( true == get_transient( 'google_jquery_available' ) ) {
		
		//Load jQuery from Google
		wp_deregister_script( 'jquery' );
		// Add version for plugins that enforce a minimum jQuery version
		wp_register_script( 'jquery', $url, array(), $version );
		
	} else {
		
		// Check if Google CDN is available
		$resp = wp_remote_head( $url );
		
		if ( ! is_wp_error($resp) && 200 == $resp['response']['code'] ) {
			// Set Google CDN as available and load jQuery
	
			wp_deregister_script( 'jquery' );
			wp_register_script( 'jquery', $url, array(), $version );
			
			set_transient( 'google_jquery_available', true, 60 * 30 );
		} 
	}
}