If you install phpmyadmin on your Server Version 4.XX, the Browser shows a Javascript Error if the Performance Monitor is opened. Problem is the mostly the setting “localhost” on the config.inc.php file.
If you want to view the monitor from external, set the ip to 192.XXX.XXX.XXX or domainname and control that the MYSQL Server is listening on all IPs!
Warning! If you dont really need this tool DONT CHANGE the MYSQL Server IP to listening “ALL” cause LOCALHOST is much more secure! Localhost should work if you have installed a local proxy on the Server! So you can relay the Interface!