Code that uses synchronous AJAX feels very slow. It is detrimental to the user experience.
For data that can change during the user experience, replace
GlideAjax, a callback function, and a custom function in a Script Include that returns only the needed information. For data that remains the same after the form loads and can be determined before the form loads, replace
g_form.getReference with a Display Business Rule and g_scratchpad. If using
getXMLWait, replace with
getXML and a callback function.
Time to fix