Linksys EA8500
DD-WRT v3.0-r40900 std (09/04/19)
Linux 4.9.190 #464 SMP Wed Sep 4 06:28:06 CEST 2019 armv7l
all very good -- Now using HFSC CAKE :')

http://www.dslreports.com/speedtest/53879728
http://www.dslreports.com/speedtest/53879807

mrjcd@Deb:~$ speedtest-cli --share --server 17386
Retrieving speedtest.net configuration...
Testing from Brazos Internet (96.46.208.xxx)...
Retrieving speedtest.net server list...
Retrieving information for the selected server...
Hosted by Windstream (Dallas, TX) [192.57 km]: 44.978 ms
Testing download speed................................................................................
Download: 46.10 Mbit/s
Testing upload speed......................................................................................................
Upload: 46.04 Mbit/s
Share results: http://www.speedtest.net/result/8560850428.png
mrjcd@Deb:~$ speedtest-cli --share --server 2495
Retrieving speedtest.net configuration...
Testing from Brazos Internet (96.46.208.xxx)...
Retrieving speedtest.net server list...
Retrieving information for the selected server...
Hosted by IBH IT-Service GmbH (Dresden) [8550.23 km]: 205.359 ms
Testing download speed................................................................................
Download: 17.90 Mbit/s
Testing upload speed......................................................................................................
Upload: 9.61 Mbit/s
Share results: http://www.speedtest.net/result/8560852083.png
mrjcd@Deb:~$ speedtest-cli --share
Retrieving speedtest.net configuration...
Testing from Brazos Internet (96.46.208.xxx)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by WesTex Connect (Abilene, TX) [138.14 km]: 29.073 ms
Testing download speed................................................................................
Download: 45.22 Mbit/s
Testing upload speed......................................................................................................
Upload: 43.33 Mbit/s
Share results: http://www.speedtest.net/result/8560854764.png
mrjcd@Deb:~$ 

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Netgear WNDR3700 V4
DD-WRT v3.0-r40900 std (09/04/19)
Linux 3.18.140 #52737 Wed Sep 4 03:51:49 +04 2019 mips
GUI install over r40890.
Tis all good

#

Linksys WRT160NL
DD-WRT v3.0-r40900 std (09/04/19)
Linux 3.10.108-d8 #20906 Wed Sep 4 02:25:33 +04 2019 mips
GUI install over r40890.
All good ...and it didn't even require a power cycle this time as it did when installed r40890 ---
using the exact same Linux machine, same Chromium browser, same everything :')