High ping latency with iOS devices (iPad / iPhone)

pinging my iPad / iPhone shows an unreasonable high latency even if there’s no load on WiFi:

… while pinging my other devices from the iPad does show a lower latency (less than 10ms).

But then I discovered that the latency drops when I run speedtest on the iPad:

So I assume it’s related to some energy saving policies. Perhaps by scanning for (/receiving) signals less frequently the device could save the battery’s life. But once there’s some work to do, the device automatically disables the energy saving policy and runs on full speed.

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