Intermittent and poor WiFi performance
I'm a bit stumped about this one so hoping for some input. Unsure if this is a controller issue or an EAP issue.
I have an Omada system with 10 (mostly) hardwired APs (225s, 245s and 115s) running off a software controller (5.9.9) with an ER605 v1. Internet access is a challenge here, so I have 2 primary WANs and a back-up WAN configured on the gateway. Almost all users are connected via WiFi. I have roughly 5 SSIDs per AP, some rate limited and others not.
I’m struggling with WiFi users experiencing small stutters / performance hits for a few seconds every couple of minutes on the WiFi network that I can't quite work out. These don’t impact wired users (connected directly to either the ER605 and the connected unmanaged switch) and appear to not be internet related as during these stutters WiFi devices also cannot access other devices on the local network / router landing pages etc. They seem to affect all APs and all SSIDs equally, including those that are in pretty isolated areas with minimal interference and no other detectable WiFi networks. Apart from the stutters, actual response times and download speeds via WiFi are also slowed (response times slow from 30ms wired to 65ms on WiFi, downloads from 40mbps wired to 10mbps on WiFi, BUT uploads are maintained at 20mbps both wired and WiFi).
Could this all be interference? No amount of adjusting channels / AI WLAN Optimisation has helped. The EAP CPU usage is never more than 5%, and memory usage between 50 and 70% on each unit. Of note, it seems that there are periods on each EAP where dropped packets (always Rx more than Tx) increase up to about 6%. How significant is this?
As an example, this is about as bad as my channel utilisation / dropped packets get:
Is this all a WiFi interference issue? Anything else I could try to improve it?