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by myfonj
1467 days ago
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Finally did some synthetic measurements of (hopefully) parse times (not render nor CSSOM or anything like that). Differences seems microscopic but overall aligned with my initial expectations (omitting the closing tag actually shaves a bit of yak's hair), so I suspect that the real overhead you observed is caused by something happening after parse, where absence of trailing white-space in DOM nodes (ensued by closing tags) helps in some way. I guess something around that white-space or text layout. (Speaking of insignificant white-space, you could probably gain some more microseconds if you'd stuck paragraphs together (`..</p>\n\n<p>..` -> `..</p><p>..`), however such minification seems like a nuisance.) Tested only on Windows, in browser consoles. Numbers: Firefox (Nightly) (performance.now is clamped to miliseconds) total; median; average; snippet
2279.0; 4.0; 4.558; '<p>_'
2652.0; 4.0; 5.304; '<p>_</p>'
2471.0; 4.0; 4.942; '<p>_abcd'
2387.0; 4.0; 4.774; '<p>_\n'
3615.0; 5.0; 7.230; '<p>_</p>\n'
2380.0; 4.0; 4.760; '<p>_abcd\n'
3093.0; 5.0; 6.186; '<p>_\n</p>\n'
3107.0; 5.0; 6.214; '<p>_</p>\n\n'
2317.0; 4.0; 4.634; '<p>_abcd\n\n'
2344.0; 4.0; 4.688; '<p>_\n\n'
Google Chrome (performance.now is sub-milisecond) total; median; average; snippet
2870.4; 5.2; 5.741; '<p>_'
2895.2; 5.4; 5.790; '<p>_</p>'
2684.7; 5.2; 5.369; '<p>_abcd'
2845.4; 5.2; 5.690; '<p>_\n'
3836.7; 7.3; 7.673; '<p>_</p>\n'
2837.8; 5.2; 5.676; '<p>_abcd\n'
4022.5; 7.4; 8.045; '<p>_\n</p>\n'
4044.3; 7.3; 8.089; '<p>_</p>\n\n'
2928.4; 5.2; 5.857; '<p>_abcd\n\n'
2805.3; 5.2; 5.611; '<p>_\n\n'
Test config Snippets per document: 5000
Rounds: 500
Wrap: '<!doctype html>(items-paragraphs)'
Content each item (_): bunch of random digits chunks, something like '1943965927 52 27 5 51664138859173 5161 7226 5 15 2 55679 6553712585'
Code: https://gist.github.com/myfonj/57a6a8fcb1c5686527412543a897c...(Before realizing I can use synthetic domparser I made something what measures document load time in iframe (http://myfonj.github.io/tst/html-parsing-times.html) but it gives quite unconvincing results, although probably closer to the real world. Understandably, synthetic domparser can crunch much more code than visible iframe.) |
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