https://bugzilla.wikimedia.org/show_bug.cgi?id=27418
Summary: CSS Reflows degrading page load performance
Product: MediaWiki
Version: 1.16
Platform: All
OS/Version: All
Status: NEW
Severity: major
Priority: Normal
Component: Vector Skin
AssignedTo: tpars...@wikimedia.org
ReportedBy: ro...@wikimedia.org
CC: asha...@wikimedia.org
Blocks: 26611
The order in which we're loading CSS and Javascript is causing some rather
unsightly reflows on more complicated pages (e.g. diff pages, recent changes,
page editing). Even though the CSS and Javascript is being delivered to the
browser faster using Resource Loader, this delivery speed benefit is more than
offset by the performance penalties of the reflows.
>From Roan: "This is because we're loading the styles for these after the page
load, even though the elements are present in the page itself. Obviously this
is bad: loading styles after page load is only acceptable for things that get
inserted by JS (which happens after the styles are loaded). Flashes of unstyled
content should not happen."
This is a work item to find and fix areas where we're loading CSS dynamically
where we don't need to, and switch to static loading in those cases
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