I've done quite a lot of speedtest.net tests over the last year and I notice that my latency values are all grouped within 29-31 ms or 44-46 ms, never any other value. The latency values only ever change if I re-boot the ZyXEL P-870H-51a VDSL2 router. A reduction in latency leads to an approx. 10% speed decrease, and vice versa.
I thought latency values could be anything and not necessarily grouped so tightly together. Anyone know why this would be the case?