1. Test
Measure a clean idle baseline, then latency during adaptive download and upload load.
Browser-based connection diagnostics
Know why your connection feels slow.
Connection Vitals measures latency while your line is idle and busy, then turns the numbers into a diagnosis you can act on. Fix it, retest, and see whether the change worked.
No account. Your before/after history stays in this browser. The test intentionally transfers data to create network load.
Loaded latencyAdaptive download & uploadBefore / afterActionable fixes
Example result
Upload queueing detected
64Score
Idle latency17 ms
Download added+18 ms
Upload added+129 ms
Bufferbloat gradeC
Gaming while busyPoor
Not another speed test
Measure responsiveness, not just megabits.
A fast connection can still feel awful when somebody uploads photos, backs up a laptop, or starts a large download. The difference is often latency under load.
2. Diagnose
Separate upload queueing, download queueing, high baseline latency and unstable jitter instead of reducing everything to one speed number.
3. Verify
Save a baseline locally, change one setting, and compare the next run side by side.
Start here
Bufferbloat Test
Our primary diagnostic. Get a common A+–F bufferbloat grade plus a separate 0–100 Connection Vitals responsiveness score.
Understand the result
Internet Quality
Learn how idle latency, loaded latency, jitter and throughput affect gaming, calls, streaming and everyday browsing.
Built for diagnosis
Useful after the test, not just during it.
Before vs after
Run a baseline, enable SQM or switch to Ethernet, then see whether loaded latency actually improved.
Raw details
Inspect median and p95 latency, loaded jitter, run duration and export the individual samples as CSV.
Open methodology
We publish the grading thresholds, scoring model, limitations and measurement engine version.