Created
August 30, 2018 07:44
-
-
Save siakaramalegos/f53e6df5004222ef952c97bd63c354fe to your computer and use it in GitHub Desktop.
Custom timings demo from Harry Roberts
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Blocking</title> | |
| <script> | |
| performance.mark('startAsyncSnippet'); | |
| console.timeStamp('startAsyncSnippet'); | |
| var script = document.createElement('script'); | |
| script.src = "https://slowfil.es/file?type=js&delay=1000"; | |
| document.getElementsByTagName('head')[0].appendChild(script); | |
| performance.mark('endAsyncSnippet'); | |
| console.timeStamp('endAsyncSnippet'); | |
| </script> | |
| <script> | |
| performance.mark('startCSS'); | |
| console.timeStamp('startCSS'); | |
| </script> | |
| <link rel="stylesheet" href="https://slowfil.es/file?type=css&delay=1000" /> | |
| <script> | |
| performance.mark('endCSS'); | |
| console.timeStamp('endCSS'); | |
| </script> | |
| <!-- | |
| <script> | |
| performance.mark('startScriptTag'); | |
| console.timeStamp('startScriptTag'); | |
| </script> | |
| <script src="https://slowfil.es/file?type=js&delay=1000®ular"></script> | |
| <script> | |
| performance.mark('endScriptTag'); | |
| console.timeStamp('endScriptTag'); | |
| </script> | |
| <script> | |
| performance.mark('startScriptTagAsync'); | |
| console.timeStamp('startScriptTagAsync'); | |
| </script> | |
| <script src="https://slowfil.es/file?type=js&delay=1000&async" async></script> | |
| <script> | |
| performance.mark('endScriptTagAsync'); | |
| console.timeStamp('endScriptTagAsync'); | |
| </script> | |
| <script> | |
| performance.mark('startSlowJS'); | |
| console.timeStamp('startSlowJS'); | |
| // Slow JS | |
| function wait(ms) { | |
| var start = Date.now(), | |
| now = start; | |
| while (now - start < ms) { | |
| now = Date.now(); | |
| } | |
| } | |
| console.log('one'); | |
| wait(1000); | |
| console.log('two'); | |
| performance.mark('endendSlowJS'); | |
| console.timeStamp('endendSlowJS'); | |
| </script> | |
| <script> | |
| performance.mark('DONE'); | |
| console.timeStamp('DONE'); | |
| </script> | |
| --> | |
| </head> | |
| <body> | |
| <h1>Hello, World!</h1> | |
| <script> | |
| performance.mark('titleRendered'); | |
| console.timeStamp('titleRendered'); | |
| </script> | |
| <script> | |
| var perfEntries = performance.getEntriesByType("mark"); | |
| for (var i = 0; i < perfEntries.length; i++) { | |
| if (window.console) console.log(perfEntries[i].name + ": " + perfEntries[i].startTime + "\n"); | |
| } | |
| </script> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment