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Detect Page Speed with javascript
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| // Taken from https://github.com/guardian/frontend/blob/5f9c1dcbb2c4270fb356711b1091d3fff7844a72/common/app/assets/stylesheets/components/pasteup/js/modules/detect.js | |
| function getPageSpeed() { | |
| var start_time, | |
| end_time, | |
| total_time; | |
| var perf = window.performance || window.msPerformance || window.webkitPerformance || window.mozPerformance; | |
| if (perf && perf.timing) { | |
| start_time = perf.timing.requestStart || perf.timing.fetchStart || perf.timing.navigationStart; | |
| end_time = perf.timing.responseStart; | |
| if (start_time && end_time) { | |
| total_time = end_time - start_time; | |
| } | |
| } | |
| return total_time; | |
| } | |
| function getConnectionSpeed() { | |
| var load_time = getPageSpeed(); | |
| // Assume high speed for non supporting browsers. | |
| var speed = "high"; | |
| if (load_time) { | |
| if (load_time > 1000) { // One second | |
| speed = 'medium'; | |
| if (load_time > 4000) { // Four seconds | |
| speed = 'low'; | |
| } | |
| } | |
| } | |
| return speed; | |
| } | |
| function getPixelRatio() { | |
| return window.devicePixelRatio; | |
| } |
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