Slow wifi speed on Huawei EchoLife HG556a

wifi speed slow!


original firmware

and if you connect using a cable instead of wifi ?

cable 98-mbit

DHCP Lan 30-35mbit

WARNING: netperf returned errors. Results may be inaccurate!

Download: 29.74 Mbps
Latency: [in msec, 60 pings, 0.00% packet loss]
Min: 17.920
10pct: 18.550
Median: 22.594
Avg: 25.345
90pct: 38.219
Max: 45.786
CPU Load: [in % busy (avg +/- std dev), 54 samples]
cpu0: 97.2 +/- 2.6
Overhead: [in % used of total CPU available]
netperf: 55.2
.......................................................
Upload: 32.89 Mbps
Latency: [in msec, 59 pings, 0.00% packet loss]
Min: 16.721
10pct: 17.201
Median: 22.992
Avg: 28.149
90pct: 40.714
Max: 117.106
CPU Load: [in % busy (avg +/- std dev), 49 samples]
cpu0: 100.0 +/- 0.6
Overhead: [in % used of total CPU available]
netperf: 74.0
root@OpenWrt:~#

Netperf run towards what, via what?

If via wireless, you seem to max out the CPU.
Check if there's an off load setting in the wifi section.