Gaming device and connection
Record the gaming device and whether it uses Wi-Fi or Ethernet.
Free Diagnosis
Gaming problems are often latency/jitter problems, not raw download-speed problems.
Measurement Plan
Separate ping and loaded-latency problems from simple download-speed problems.
Record the gaming device and whether it uses Wi-Fi or Ethernet.
Run one speed test close to the router using the same device you will use for the room test.
Record ping or latency while the connection is quiet.
Run a speed test or upload, then record latency while the connection is busy.
Notice whether lag gets worse when others stream, upload, or video call.
Retest the same game or ping target after trying Ethernet, SQM/QoS, or pausing upload-heavy apps.
Gaming lag