OP, I have the XR1000 but have the exact same results/issue as you. Recently our ISP upgraded us to Fiber 1Gb both download and upload and now I get high pings on loaded up/down test in the router and on websites like the buffer-bloat page you posted. I don't mess with the "flower" as it just seems confusing (if not bugged) but I have messed with the sliders at the top and though they say 70% is usually a good place to start for gaming after a bunch of testing I have found the best settings for mine is all the way down to 23% on download and 42% on upload in order to get good results ...which seems ridiculously low to me, with the down/up set to 1Gb that's only giving me 230 down and 420 up. My base ping is 14-15ms with a 0.07% jitter (both good) and while I don't get the full 1,000Mbps up/down (usually in the 900s) and the baselines are always very stable. There is no way my network is "saturated" or anywhere near it, If I go to the network monitor page I have never seen the total usage above 20-30Mbps total (all devices combined) and that's only when I'm streaming a 4K UHD movie. On the connection benchmark page my Speed and Ping are always A+ but the Ping Under Load is always a D, unless I turn on the QoS and have the sliders set as I mentioned above at 23% down/42% up. I have done a full long process reset, reinstalled the firmware, everything. Nothing changes this one problem that I have found...
It's honestly starting to make me wonder if this "Gaming Router" and it's DumaOS is actually designed to handle 1Gb connections. I never had the problem until our ISP bumped us up to the 1Gb speeds, we used to be 50 Mbps down/15 Mbps up and the network wasn't saturated then and we always had A+ on all three categories, we get 1 Gb fiber and now we have speed but the buffer-bloat kicks in and our loaded speeds jump up to 80-120ms on the Ping Under Load section.
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Wintercabin reacted to SouthernGypsy in Bufferbloat HELP! - XR500
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