Router: hAP ac^2, 6.49 (stable)
I have a problem that shows very different speeds over Wifi and PC (lan).
All private servers, use html speedtest (all http protocol).
1 Server result: PC 263.60Mbs / 479.03Mbs, Iphone 11 pro max 68.06Mbs / 449.56Mbs
2 Server result: PC 820.34Mbs / 849.13Mbs, Iphone 11 pro max 484.52Mbs / 481.71Mbs
3 Server result: PC 253.24Mbs / 402.53Mbs, Iphone 11 pro max 82.98Mbs / 503.4Mbs
Matuok.lt public speedtest result: PC 725.8Mbs / 903.1Mbs, Iphone 11 pro max 164.7Mbs / 485.4Mbs

I understand my Wifi ceiling is 500Mbs. But why does one server always reach the ceiling and full connectivity? Ordinary microtik bug?
It was different for a friend to use up to 50Mbs (Wifi and LAN) for at least some uploads. Even with his ISP the router was all right, eventually he switched to ubiquiti and no longer had a problem.
For me, ubiquiti is too expensive, mikrotik all so praised, and such problems ...

Pffff .... don't get the picture of this test.
What's the difference between server 1,2,3 ?
PC speed is ethernet connected ? IPhone is wifi connected?

What are the "registration table" values in the AP for each wifi connection while sending? TX rate, RX rate, CCQ, frames/hwframes ratio, P-throughput, Signal, SNR ????

hAP ac2 is a dual chain (2S) 802.11ac device. Max interface rate is 866 Mbps at MCS 15 (perfect quality signal needed) at 80 MHz bandwidth.
MAX Data throughput is around 50-60% of the interface rate.
Clent devices (server, Iphone) will slow down due to TCP congestion avoidance controls in those devices.
ANY interference in the freq channel on wifi will slow everything down. (This is very dynamic)
AUTO freq selection on MT is mostly just not a very smart selection.