What the port describes
A port rate is a nominal interface capacity. It does not establish how much application data will reach a particular destination. Protocol overhead, storage speed, CPU processing and other network paths can reduce usable throughput.
What transfer accounting describes
A transfer allowance counts data over a period. Unmetered usually describes the accounting model rather than unlimited physical capacity. Check the actual terms, acceptable-use rules and any traffic conditions before treating a label as a commitment.
Where the bottleneck lives
A busy download service may need fast storage and enough CPU to encrypt traffic. A dynamic website may spend most of a request waiting on a database. Measure the workflow you need rather than assuming a larger port fixes every delay.
Compare with evidence
Use representative destinations, file sizes and time periods. A single speed test shows one route at one moment. Record the method and compare the results with the service conditions. Choose capacity around expected traffic and agreed obligations, not the largest number on a card.