sfx2000
Part of the Furniture
High speed with PPPoE will always be tricky. It's not a matter of manufacturer, but the platform itself. Most likely that a Netgear also using the same Broadcom chipset would give you the same results as the RT-AC68.
I'm DHCP for WAN access, but if I recall correctly, PPOE is single threaded due to kernel/ip stack design, and as a result, pinned to a single core...
Is this still the case?