You can hide the bandwidth graphs in the WHMCS admin area via an option in customconfig.php. This can be useful if you integrate your own bandwidth graphs and the provider API is slow. 

How to disable Admin Network Graphs

The function can be disabled via customconfig.php, which can be found in the directory "/modules/servers/dedicated/"

• Navigate into the directory /modules/servers/dedicated/
• Open the file customconfig.php, or create the file if it does not exist.
• Insert "$disable_admin_networkgraphs = 1;"

If you have newly created the file, don't forget to add a PHP opening tag at the top of the file.