I’ve come across this a bit today on our work install due to some new devices with 1500 ports.
The overall traffic graph is what seems to kill it. That graph specifically has the ability to exclude certain interfaces so I added ones we don’t care much for to the list and it’s massively improved the performance:
$config['device_traffic_iftype']
$config['device_traffic_descr']
Both are arrays and preg_match so an example is:
$config['device_traffic_iftype'][] = '/propVirtual/';
Give it a shot