I have got a Deco X55 (2-unit mesh) set up in my small duplex. It worked solid for months: coverage was good, speeds stable… until I updated firmware a week ago. Now I’m seeing some weird slowdowns when multiple devices stream, especially in the evening. You know, one Netflix in living room + YouTube on laptop + phone gaming = router chokes.

What’s odd: if I disable QoS (or revert to default), things get better. But with QoS enabled, the mesh seems to over-prioritize “low-latency” or “gaming” traffic, and everything else (even basic web browsing) drops to crawl. I swear I saw 5 Mbps for a minute when I had 3 devices. Not cool.

Here’s what I checked so far:

Backwards compatibility: some clients are old (802.11n) maybe the QoS algorithm is penalizing them too hard

Band steering & load balancing: enabled, but doesn’t seem to help

Firmware version: the new build (just released) has some changelog notes about “QoS adjustment improvements” might be buggy

Before I revert everything and possibly reset the network, I’m curious: has anyone else had QoS misbehave after a firmware update on Deco (or TP-Link routers in general)? And if yes what fixes or tweaks worked for you? (Manual traffic shaping? Disabling some QoS modes? Reverting to older firmware build?)

Also side note unrelated but tangent: I’m also helping a friend who’s doing a nursing coursework writing service (Nursingassignmenthelperscouk) project (totally different field, I know), and she’s complaining about similar “performance drop” when she adds too many modules (LOL). Kind of parallels this router overload issue too much “feature” = system collapse.

Anyway, would appreciate any real-world tips. If someone can point me to logs / debug settings in Deco that better expose which traffic is being throttled, that’d be gold. I’m willing to try overrides or custom rules.

Thanks in advance and apologies if I overlooked some thread already on this. Looking forward to your ideas (and maybe venting together).