My guess is it’s software, since some of these devices have different SoCs. Wasn’t a huge problem. If I remember correctly, the latency was going into tens of ms but not hundreds of ms under load. That was significantly worse than an equivalent R7800 bridge (OpenWrt WDS) where latency increases insignificantly, but it isn’t bad enough to notice in most applications but things like FPS games. VoIP doesn’t like latency spikes but I think it needs hundreds of ms to appear as an audible problem.