Why is my gigabit Ethernet test stuck around 90 Mbps?
A 100 Mbps Ethernet negotiation commonly produces results near 90–95 Mbps. Check for a damaged/two-pair cable, 100 Mbps port, adapter/dock limit or forced speed setting.
Link speed; cable category/condition; port and adapter capability.
Escalate if router port will not negotiate gigabit with known-good equipment.
Show the technical detail
On a managed Wi-Fi plan
Inspect gateway port negotiation where telemetry allows; retest with known-good Cat5e+ cable and gigabit adapter.
On another provider's router
Same physical-layer checks apply to any ISP.
What to be careful of
Do not attribute a 100 Mbps link ceiling to Wi‑Fi.
Where this comes from: Official · see the original source ↗ · Draft—technical review · checked 17 August 2026