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I should add, speedtests were originally intended to test the speed of your local connection to your ISP, e.g. your cable or DSL line, back when that was almost inevitably the limiting factor in your path to "the internet". Nowadays that is no longer the case, with end user connections exceeding some speedtest servers' as well as significant amounts of congestion in between.

That means the relevance of speedtest as a whole is decreasing, though Speedtest.net keeps itself relevant by offering lots of different servers to test multiple paths do different places on the internet - which is becoming more important now than simply the speed of the modem in your home.

Another point, as has been mentioned many times before, is that speedtests only measure one thing reliably - how fast your connection is at running that particular speed test. It's not neccessarily an accurate predictor of trying to do anything else on your connection of actual relevance. So as long as at least one speedtest is indicating 50mb, that means your equipment is functioning correctly and all else is up to the gods.

Finally in my opinion speedtests can be useful in helping the diagnosis of a fault, but a poor speedtest result in itself is not indicative of a fault.