ookla has released a new app for testing latency simultaneously with load for ios and android.
https://www.ookla.com/articles/introducing-loaded-latency
How accurate it is, is unknown. I'd be very interested to know results with sqm on and off, and with fq_codel enabled chipsets vs not.
Hopefully they'll port that over to their desktop app for Windows.
Amazing how many (one would think) unnecessary permission the Android app wants to have....
Speedtest takes up so much bandwidth loading ads that you don't know what the real speed is.
Not on the Desktop app.
you guys are tough. A test of this new app, with sqm on and off, on something, was all I'm hoping for. 
5GHz WiFi over my low end android phone is less than ideal for a speed test I expect. With SQM (CAKE) Speedtest result is 103/19 Mbps down/up with down/up ping of 100/20 ms. With SQM turned off, result is 107/23.3 Mbps and 99/56 ms on my phone. Distance to the Linksys EA8500 AP used for the testing was 10 feet of air.
My ISP service is a 400/20 DOCSIS 3.0 cable modem to a NanoPi R4S Gateway. Actual provisioned speed is ~450/23, but I've set ingress/egress for SQM at 400/20 to stay below cable service top speed during high use times of day. The EA8500 AP is connected to the NanoPi R4S with wired back haul through a GS308T managed switch.
From a linux thin client desktop with a 2x2 Intel AX200 card that is some distance away from the EA8500 AP with intervening walls, the desktop browser Speedtest result is 340/19 Mbps and 22ms ping (unloaded only) with SQM on; and 365/23 Mbps and 20ms ping (unloaded only) with SQM off. Obviously this is a better WiFi client than my Android phone 
The Waveform buffer bloat test from my thin client (so again over WiFi) with SQM is 290/18 Mbps with mean ping of 33/38/29 ms (unloaded/down/up). As is typical, Waveform runs out of throughput before my ISP service or attainable WiFi speeds top out, and at least in my location, Waveform results are so variable from test to test and time of day that I rely on it for no more than a rough indication.
From a wired desktop, Speedtest results are consistently repeatable with and without SQM and obviously the CPUs in the NanoPi R4S do not slow anything down. But same issues with the Waveform test for me: repeatability is poor and reported down/up speeds are all over the place, except never approaching the consistently repeatable speeds indicated by Speedtest.
Interesting.
My Waveform results stay pretty consistent...but I test wired-only 99% of the time.
That's why I'd like to see Ookla port it to their Windows Desktop app.
The Ookla Speedtest is quite a bit more popular than the tests frequented by the denizens of this forum. So long as it is accurate enough to at least give a rough indicator, hopefully it will be a net "good thing" due to putting some positive visibility on buffer-bloat.
I test wired whenever I'm tuning settings. Full disclosure, I was too lazy to walk upstairs to a wired desktop for above post. Having now shamed myself into it...
Here are wired results with SQM on: Waveform 238/17 Mbps down/up and 28/30/29 ms unloaded/down/up; DSLReports 371/20 Mbps down/up 60/55/58 ms unloaded/down/up; and finally Speedtest 382/19 Mbps and 21 ms ping unloaded.
With SQM off, Speedtest reports 454/23.5 Mbps and 21ms ping unloaded. With SQM off Waveform is reporting anything from line rate (925 Mbps down) to 1.5 Gbps download today...so I need to retract that it never indicates as fast as Speedtest. However, I only have Gigabit ports and switches on the network, Cat 5E cable and I'm fairly confident my ISP hasn't upgraded me to 1.5 Gig LOL....at any rate, for whatever reasons, Waveform has been hit or miss for me.
The new ios and android app reports on latency under load, e.g. ping while also uploading or downloading. The detailed results show this...
I did test under load (up and down) with my android phone using the new Speedtest app that provides results for ping under load, with and without SQM. The results I posted are a bit rambling and disorganized, but ping under load from the detailed results of the new android Speedtest app were reported.
In my case, my low end android phone has such poor WiFi capability that it is just not going to provide a meaningful comparison of the new Speedtest android app to any thing really. I suppose that's the main point of my post.
I do hope this new Speedtest phone app capability migrates from the phone app to the Speedtest Web tool. Anything that helps raise buffer bloat awareness with the masses is a good thing in my opinion.