Delay and throughput answer different questions

Begin with the experience

Opening a small page includes time spent finding an address, establishing a connection, negotiating security and waiting for a response. Downloading a large object adds a longer period of data transfer. One can improve while the other stays much the same.

Describe the symptom in those terms: a long pause before anything appears, or steady progress that feels too slow. That description helps choose a useful measurement.

Compare like with like

A transfer rate depends on the object, the path and how the measurement counts time. A brief burst at the start is different from an average over a completed transfer. Use the same object and a similar time window when comparing two readings.

Several modest repetitions show variation more honestly than one peak value. Note interruptions and unsuccessful attempts as well as the successful rate; missing attempts can make an unstable path look unusually good.

Stop when the next decision is clear

A simple check should have a time and data budget. There is little value in downloading an ever larger file when the result already answers the question. If repeated readings vary more than the proposed improvement, keep that uncertainty visible and try a more focused question later.