Flint 2 WAN Latency when downloading

Hey folks.

I've recently got a Flint 2. Running firmware OpenWrt 21.02-SNAPSHOT r15812+1071-46b6ee7ffc and kernel 5.4.238 with the actual version at 4.5.8.

I'm using the Flint 2 as a router with 5Ghz WiFi and other devices connected through ethernet and 2 TP Link APs connected through ethernet for other wireless clients.

I was doing some testing regarding latency whilst downloading.

My internet is 900/115. I have a client on the 2.5Gbps port.

I downloaded some content from Usenet @ ~44MBps and noticed later on a high spike in latency on my thinkbroadband quality monitor.

Look around 10am. https://www.thinkbroadband.com/broadband/monitoring/quality/share/b6d8e2ee3f3ac629962b2c7aaf0bd5d60c62dd8b-02-06-2024
When I noticed I decided to stop and check my router settings, I've got client VPN disabled for now and my Hardware acceleration is on.

So I resumed the testing and you can see the same spike in latency.

Compare this to 4 days ago when I was using my TP Link as the router and downloading at my maximum line speed where the latency was much lower.

What gives with this? How can I reduce this latency?

I had a Virgin Media modem back in the day with some broadcom or intel chip and it reminded me of the latency that I just saw.

I decided to do a bufferbloat test alongside the Usenet downloading. Here's the result https://www.waveform.com/tools/bufferbloat?test-id=2544e57a-971a-4fbf-8e5e-fc062e809f67

Did you try SQM? It’s a game changer on latency during heavy loads

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Thanks, here's my result which is worse.

What have I done wrong?

Edit: I left NAT acceleration on.
But with it turned off I got a really low download speed https://www.waveform.com/tools/bufferbloat?test-id=93a3bcb4-5be5-486d-91c8-2999c36b4118

Got a similar result elsewhere too, but on the first too I got around 660mbps before it dipped to under 200mbps.

Switched SQM back off and NAT acceleration back on and got my speed back.

Reboot the router after turning it off. The speed I use is: line speed - 7%
The speed will be a little bit lower but latency should be way better.
Ohh you’re using pppoe :thinking:

Yes using pppoe with openreach fttp 1000/115