Before I start I would just like to say I am using a Cake implementation via Asus merlin firmware but I can configure all options if needed so should be somewhat relevant. I don't know if this is a bug or not. Download and upload values are really lenient as is 40/9.84 (usually 45.5 and 11.3 without any qos).
Here is a normal waveform result when nothing is going on: https://www.waveform.com/tools/bufferbloat?test-id=3c861818-d8ac-4f7f-9bae-dfb2dc889feb
If I could have this all the time then no issues. I was downloading the overwatch 2 season 3 update and I limited myself to ~20Mbps in the blizzard launcher. I thought to myself I'll play street fighter online while I wait... bad idea. It became apparent very soon that I was having issues that I don't really understand. A waveform as the overwatch 2 update happened: https://www.waveform.com/tools/bufferbloat?test-id=fec730b2-d28c-4be7-bd8c-127f9f672038
I get the 4k video streaming since download went down but I have much worse jitter. I don't get that at all. How can saturating the bandwidth in the very first result = 1 ms jitter but running a download at half the rate of my connection and letting waveform use the other is somehow causing higher jitter. Both the overwatch 2 download and waveform were performed on 2 different pc's both wired in but the same issue happens if I just have 1 pc doing the waveform and the download.
Is there some setting I've missed in cake or is this some ISP issue I can't fix? If it's ISP why is a single pc able to max my bandwidth and not show any issues but as soon as another pc takes some bandwidth it's just very bad?