The Speed Test vs. Reality Gap
The Mbps vs MB/s Confusion
900 Mbps ÷ 8 = 112.5 MB/s maximum theoretical speed. Protocol overhead reduces this to ~100–105 MB/s in real conditions. A Steam download at 100 MB/s on a gigabit plan is excellent performance.
Download Server Bottleneck
Speed tests use optimized servers. Real sources (Steam, Epic Games) may be congested with 100,000+ users downloading simultaneously — your connection is fine, but the server is the limit.
Single-Thread vs Multi-Thread
Speed tests use multiple parallel connections. A single file download is single-threaded and typically caps at 100–200 Mbps per TCP stream. Download managers like JDownloader use 8–16 parallel streams to approach true bandwidth.
ISP Selective Throttling
If using a VPN makes a slow service suddenly fast, you have confirmed ISP throttling of specific traffic types — while speed test servers remain unthrottled. See our ISP throttling detection guide.
Realistic Expectations
On a 1 Gbps plan, expect 80–110 MB/s on well-provisioned sources. Below 50 MB/s consistently? Investigate your router or contact your ISP.
Frequently Asked Questions
Why is my download speed slower than my speed test result?
Speed tests measure the maximum throughput your connection can achieve in a controlled burst to an optimized test server. Real downloads depend on the server you're downloading from — a small server with limited bandwidth, a CDN under heavy load, or a site throttling download rates all create bottlenecks on the server side that have nothing to do with your internet plan. Your connection may be capable of 500 Mbps while a particular download only gives you 20 Mbps because the source server is the bottleneck.
Do speed test results reflect Netflix and YouTube streaming speed?
Partially. Speed test results reflect your raw connection capacity; streaming quality depends on that plus CDN server proximity, your device's video decoder, and whether your ISP throttles streaming traffic specifically. If your speed test shows 200 Mbps but 4K Netflix buffers, run Fast.com (Netflix's own tester) — if that also shows low speeds, your ISP may be throttling Netflix traffic specifically rather than your general connection.