Poller performance

As for your suggestion, I’m looking at the poll times for each module to find long ones.
I found it takes about half a second for each device to poll cisco-voice stats. I don’t need it at all, so I thought I can disable it for each cisco device.
Looking here https://docs.librenms.org/#Support/Discovery%20Support/#discovery-config I found the way but that specific module is not specified. I assumed it has the name as in the graphs, cisco-voice.
I put this in my config.php
$config['os']['ios']['discovery_modules']['cisco-voice'] = 0;
After verifying that my device host field in the db is ios.
After some polls it seems it is still polling, and have


for Global/OS/device. So it seems it is still enabled and of course I cannot switch it off for each router.
What am I missing here? Also, is there a way to see the definition for the OS tag (“ios”) without looking at the DB?
Thanks

Edit: rediscovered the device with no success