Performance itself is a study in contrasts. On paper, 802.11ac and the 8811CU support useful link rates; in practice, performance hinges on driver maturity. The best drivers unlock higher throughput and stable 5 GHz operation; lesser ones produce micro‑stutters, increased latency, or poor range due to suboptimal antenna handling and power‑saving defaults. The adapter’s physical design compounds this: tiny antennas and crowded USB port placements reduce real‑world throughput compared with integrated laptop radios or larger, external‑antenna adapters.