Consumer-grade Wi-Fi is also a major problem when it comes to latency & jitter. It doesn't even have to be game streaming, any real-time application such as calls suffer from it as well, despite not actually requiring much bandwidth at all.
Unfortunately there is no user-friendly tool to test for this. Most tests focus purely on speed, which can be tricked by various packet-loss-compensation algorithms, so you can score a "perfect" 1Gbps speedtest despite the connection cutting completely for a second.
I remember it using a Java applet. I think the reason none of the online test sites support it is because it’s hard to test latency & jitter in the browser as the lower layers try hard to compensate for it.
Speedtest for random server (servers listed on Ookla is quite random) is useful but ping for random server is a bit useless. Just ping for targeted server that runs service you use.
I'm somewhat surprised the 4 sibling comments as of this writing don't even mention the latency/jitter issue-- to me, that's always been one of the obvious biggest flaws with game streaming. Your average consumer has little to no awareness of it, it's beyond Google's control, and it has a very noticeable impact to anyone experiencing it. Not a good combination.
Edit: Nextgrid showed up as I was typing this and set the record straight. My faith in HN is restored.
Unfortunately there is no user-friendly tool to test for this. Most tests focus purely on speed, which can be tricked by various packet-loss-compensation algorithms, so you can score a "perfect" 1Gbps speedtest despite the connection cutting completely for a second.