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measuring latency under load within the internal network can be done with Crusader (straight forward application) or Flent (has more options but is also more difficult to use)
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On access points you can experiment with codel target and aql to get latency down - see also GL.iNet GL-MT6000 - AQL and WiFi Latency (see post 71 for my results) and Reducing multiplexing latencies still further in wifi
What I noticed is that using a DFS channel (i.e. 100) reduces latency as well -
the custom build from peas1234 has already several optimizations built-in for latency reduction - see MT6000 custom build with LuCi and some optimization - kernel 6.6.x
(when flashing, make sure to not keep settings) -
for SQM on the main router you can compare between fq_codel + simple.qos vs cake+piece_of_cake.qos (set interface on the wan port)
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