Hi, don’t misunderstand me. I cannot explain that low performance with the information given. And I have no intend to start tests (I do have here a hAP Lite, mAP Lite, hAP ac Lite and HAP ac2)
Being very technical I just react on technical statements where I could be more specific about.
So again, don’t take this wrong , the hAP ac2 performance given is low, and the hAP Lite performance is disappointing as it is only half of that already low performance.
(I get 290 Mbps real data rate single direction out of my hAP ac2 connected via a SXTsq chain in the field, on a 433Mbps/40MHz/2S/SGI connection on 5GHz, 802.11ac)
The mAP Lite and cAP Lite have a MIPSBE cpu, and 64MB of RAM.
Only the hAP Lite and hAP mini have this lower hardware: SMIPS cpu and 32 MB of RAM. (SMIPS seems to be a different instruction set as the RouterOS barely gets into the 16 MB ROM when SMIPS is used. There have been workarounds on the forum to squeeze it in.)
The ethernet MTU (1500 bytes) is a different animal than the aggregated packet size for wifi. For 802.11n the maximum A-MPDU is 65535bytes. For 802.11ac the maximum is even 1Mbyte!
And your max internet packet (1492 bytes) is not that much larger than this test with 1000byte packets.
http://forum.mikrotik.com/t/how-to-get-rid-of-slow-wifi-can-it-be-done/139640/1
http://forum.mikrotik.com/t/802-11ac-wave2-support/127501/1
Mikrotik has a rather poor aggregation implementation with smaller sizes and static settings. Other brands implement an intelligent adaptive algorithm and the full standard sizes.
And one more: most forum users know that the software “stable” channel is far from stable. The performance of the 6.48(.0) is unknown. Use LongTerm for operating Mikrotik devices.