I don’t know if this will be helpful info or not. I didn’t do any ‘before’ tests on 4.6.2 just before we upgraded about 3 weeks ago, but here are some ‘after’ tests done just now on 4.7 firmware. This link is a short 1.4 km link, signals about -52, in 80MHz mode.
Latency while carrying about 240 Mbit of client data right now (2.52ms average)
PING 10.201.3.3 (10.201.3.3) 32(60) bytes of data.
40 bytes from 10.201.3.3: icmp_req=1 ttl=64 time=2.18 ms
40 bytes from 10.201.3.3: icmp_req=2 ttl=64 time=1.82 ms
40 bytes from 10.201.3.3: icmp_req=3 ttl=64 time=3.23 ms
40 bytes from 10.201.3.3: icmp_req=4 ttl=64 time=2.13 ms
40 bytes from 10.201.3.3: icmp_req=5 ttl=64 time=2.62 ms
40 bytes from 10.201.3.3: icmp_req=6 ttl=64 time=2.41 ms
40 bytes from 10.201.3.3: icmp_req=7 ttl=64 time=3.38 ms
40 bytes from 10.201.3.3: icmp_req=8 ttl=64 time=1.38 ms
40 bytes from 10.201.3.3: icmp_req=9 ttl=64 time=3.14 ms
40 bytes from 10.201.3.3: icmp_req=10 ttl=64 time=2.91 ms
— 10.201.3.3 ping statistics —
10 packets transmitted, 10 received, 0% packet loss, time 9010ms
rtt min/avg/max/mdev = 1.382/2.524/3.387/0.624 ms
The baseline client data on this link is about 240 Mbit, and the Wireless Link test shows about 500 Mbit in either direction.

We have had no issues for 22 days – it’s stable and working fine for our needs.