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Why such wide variance in LAN ping times to a nearby uncontested Wifi AP? [closed]

        I'm seeing unexpectedly high ping times to a private WiFi AP device on a small office network.
If I ping the WiFi AP directly for a few minutes, I see most pings return with <3ms, some around 10-20ms and a few >300ms. With a wired connection to the AP, it is a consistent <1ms. I wondered whether another nearby device might be interfering. This office has a single wireless AP. I used built-in Mikrotik features and scanned locally for other WiFi devices. There were several weak signals nearby. I switched the AP's radio channel from "auto" to a selection of known uncontested channels and reran the same test. I got the same wide variance in ping times on all uncontested channels. Test laptop was within a couple of metres and with direct line of sight of the AP. The WiFi AP device is a Mikrotik hAP ac3 (Model RBD53iG-5HacD2HnD). It has out-the-box vanilla configuration. I've not got a huge amount of network experience. Is this wide variance with wireless ping times to be expected? If not, where should I start with further troubleshooting?

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