As some of you might know, recently buildsfor this new device started being made, so I decided to test them out. But there's a little issue that I can't seem to diagnose whatsoever, either with logging or anything else.
On the stock firmware, even with hardware NAT disabled (as it's buggy), I get full speed on my line: http://www.speedtest.net/result/5904234776.png
However, with LEDE, stock settings (both my custom build and the snapshot builds), my speeds are dropped to this: http://www.speedtest.net/result/5915271748.png
This is a consistent result, and it doesn't change, almost feels like there is a hard cap somewhere in the 30 Mbps field with LEDE. As soon as I revert back to stock, I'm back at 90+ Mbps. I very much doubt this is a hardware NAT issue, as even my old 841ND held 80 Mbps both on stock firmware and on LEDE/OpenWRT/DD-WRT, and I have the HW NAT disabled on the stock firmware as it has a bug where the speed spikes to max then starts dropping suddenly, works fine with it off.
This is the most recent snapshot btw, as of this post. My custom build is also synced with all the changes up until now.
I know this is a very recent device, but if there's any suggestions... Thanks!
Edit: After some troubleshooting via WiFi, it seems WiFi devices get a slightly higher speed than my LAN device, but after testing a few more times, it's around the same. Supporting devices also don't sync to 144/300/400 Mbps as they did before on 802.11n/40Mhz and the 841ND but that's something to resolve later.
Edit 2: So, breakthrough. Connected my laptop to LAN, which synced at 1 Gbps (unlike my desktop because it uses a long cable to the router, but still regardless got 95 Mbps, whilst synced at 100 Mbps) and that worked just fine. I wonder if it's a Ethernet speed negotiation issue. Edit 3, which it isn't, as LEDE says it's synced at 100 Mbps Full-Duplex. The stock firmware, despite syncing at 100 Mbps, also attains full speed, so I don't know what could be happening for it to cut the speed so much. I suspected it was syncing at Half Duplex.
Edit 4: Confirmed that it is an issue relating to LAN devices synced at 100 Mbps. Now... I don't know of any solutions. The stock firmware and previous routers handle this just fine, with or without NAT acceleration. WiFi devices reach 60+ Mbps.
Edit 5: Seems to be WAN > LAN only. LAN > LAN (via USB/Samba) does not present this behavior.