bamaguy

This should work, but requires editing wp-login.php

Edit wp-login.php after:
<?php

Add:
define('THIS_SCRIPT', 'login');

Edit register-plus.php after:

/*
Plugin Name: Register Plus
Plugin URI: http://skullbit.com/wordpress-plugin/register-plus/
Description: <strong>WordPress 2.5+ ONLY.</strong> Enhance your Registration Page.  Add Custom Logo, Password Field, Invitation Codes, Disclaimer, Captcha Validation, Email Validation, User Moderation, Profile Fields and more.
Author: Skullbit
Version: 3.5.1
Author URI: http://www.skullbit.com

LOCALIZATION
Place your language file within this plugin directory and name it "regplus-{language}.mo" replace {language} with your language value from wp-config.php

CHANGELOG
See readme.txt
*/

Add:
if (THIS_SCRIPT == 'login' OR WP_ADMIN == 'TRUE') {

Still in register-plus.php find:
?>

Add before it:
}

This reduced my queries per page to 18 from 27 on every page and my register plus plugin still works.

Maybe there is a way to do it without editing files but I’m not that good with wordpress.