| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1" /> | |
| <title>Enterprisify your Java Class Names! (by Hay Kranen)</title> | |
| <style> | |
| body { | |
| background: white; | |
| text-align: center; |
| $ # install QCacheGrind (KCacheGrind) | |
| $ brew install qcachegrind | |
| $ brew install graphviz | |
| $ brew linkapps | |
| $ pip install django-extensions | |
| $ # run profiling server | |
| $ ./manage.py runprofileserver 0:3000 --kcachegrind --prof-path=path/to/profiles |
All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.
Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.
elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent