When it comes to wireless, top speeds are misleading and the wrong way to look at it.

You can have the shittiest link possible with lots of dropouts and still get a decent speed test result because in between the dropouts you get max speed and TCP/etc is designed exactly to smooth over such packet loss, and browser-based tests aren't able to get low-level UDP access to defuse that.

Yet such a connection will be unusable for anything real-time, think gaming or videoconferencing. That's why so many people's connection still stutters on Zoom/etc calls - the "good" connection and super fancy router their ISP sold them isn't actually that good despite speed test results being satisfactory.