A speed test shows three numbers: download, upload, ping. Two of them mean something for your day-to-day; one is the bottleneck nobody talks about.
Download (Mbps)
How fast bits arrive at your device. This is what marketers advertise. 100 Mbps is enough for 4K streaming; 1 Gbps is useful only if you have multiple users + cloud-backup workloads.
Upload (Mbps)
How fast you can send. Critical for video calls (Zoom's HD-call target is 3-5 Mbps up), backups, content creation. Many residential plans heavily asymmetric — 500 down, 20 up — which falls over the moment you try to upload anything substantial.
Ping (ms)
Round-trip latency to the test server. Under 30ms is excellent; 30-80 is fine; over 100 starts to feel sluggish on real-time apps. For gamers and traders, ping is more important than bandwidth.
Jitter
The variability of ping over time. 5ms jitter is fine; 30ms jitter means your video calls will stutter even with strong bandwidth. Our Speed Test reports it.