In version 6.3 of SugarCRM are introducing a new method for loading pages that uses AJAX to load the html content rather than doing a full page refresh. This has some major impacts on performance.
You also have the option of totally disabling the AjaxUI with the following line. In config_override.php
$sugar_config['disableAjaxUI']=true;just add line above in config_override.php
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