My firmware release is V1.0.9.88_10.2.88 (current for today) and I was able to boost my internet speed from 60/5 to 170/10 by resetting the QoS first to Manual then back to letting Speedtest determine the rates.
Upgraded my Virginmedia broadband from 200/20 to 350/30. The upload speeds increased but the download speeds remained the same, around 25MB/s.
After several resets of the modem and router I beleived the issue was with the ISP's line or modem. While waiting in a phone queue this morning to speak to an agent I discovered this post and started testing with different settings.
I was on firmware 1.0.9.14 with QoS, TM and parental controls already disabled. Enabling and disabling the settings didn't make any differenence. I was at work and connected remotely, a factory reset wasn't an option.
Upgraded to firmware 1.0.9.88 (latest) and the download speeds dropped to below 20MB/s
Finally downgraded to 1.0.7.12. Had to rush home in my lunch break as I lost connection to the router. While at home factory reset the router, input all my settings and ran a speed test. I'm now getting the full speeds from the ISP ~ 48MB/s.
@dcrowmik, thank you for posting the fix and everyone else for sharing their tips.
By the way that new firmaware still didnt fix it, after being on the phone with reps for hours I found the solution myself and simply downgraded the firmware to get faster speeds, smh i thought you would have it fixed by now
Only solution I found was to purchase a different router. I got the XR500. Issues with this router is IPTV Sometimes has an issue with streaming but I reduced bufferbloat to 90% and it seemed to solve the problem for now.
