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I misunderstood Element.matches(), reverting

This commit is contained in:
gorhill 2015-03-01 19:54:17 -05:00
parent b0108c9223
commit b6f1aa263c
1 changed files with 1 additions and 29 deletions
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30
src/js/contentscript-end.js
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@ -347,34 +347,6 @@ var messager = vAPI.messaging.channel('contentscript-end.js');
// requests to process high-high generics into as few requests as possible. // requests to process high-high generics into as few requests as possible.
// The gain is *significant* on bloated pages. // The gain is *significant* on bloated pages.
// Speed boost (uBlock 0.8.9.2+):
// Element.matches is MUCH faster than document.querySelector().
//
// Example:
// gmail.com, a page rich in mutation events, which causes many calls
// to processHighHighGenerics(). Cumulative time of 24 calls to
// matchesSelector() (default filter lists):
// Chromium 40:
// - document.querySelector() = 44.79 ms
// - document.body.matches() = 6.06 ms
// Firefox 36:
// - document.querySelector() = 27.10 ms
// - document.body.matches() = 3.50 ms
//
// However, Element.matches() is available from Chromium 34/Firefox 34. So
// we fall back to slower document.querySelector() when Element.matches()
// is not available.
var matchesSelector = (function() {
if ( document.body && document.body.matches ) {
return function(selector) {
return document.body.matches(selector);
};
}
return function(selector) {
return document.querySelector(selector) !== null;
};
})();
var processHighHighGenericsTimer = null; var processHighHighGenericsTimer = null;
var processHighHighGenerics = function() { var processHighHighGenerics = function() {
@ -383,7 +355,7 @@ var messager = vAPI.messaging.channel('contentscript-end.js');
return; return;
} }
//var tStart = window.performance.now(); //var tStart = window.performance.now();
if ( matchesSelector(highGenerics.hideHigh) === false ) { if ( document.querySelector(highGenerics.hideHigh) === null ) {
//console.debug('%f: uBlock: high-high generic time', window.performance.now() - tStart); //console.debug('%f: uBlock: high-high generic time', window.performance.now() - tStart);
return; return;
} }