It reduces CPU usage on Amazon shopping pages. Enjoy your snappy shopping.
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// ==UserScript==
// @name Amazon CPU Tamer
// @name:ja Amazon CPU Tamer
// @name:zh-CN Amazon CPU Tamer
// @namespace knoa.jp
// @contributionURL https://paypal.me/kantankikaku
// @description It reduces CPU usage on Amazon shopping pages. Enjoy your snappy shopping.
// @description:ja AmazonのショッピングページでのCPU使用率を削減します。お買いものをサクサク楽しみましょう。
// @description:zh-CN 减少Amazon购物页面上的CPU利用率。顺利地享受买东西吧。
// @include https://www.amazon.com/*
// @include https://www.amazon.co.jp/*
// @include https://www.amazon.co.uk/*
// @include https://www.amazon.*
// @include https://*.amazon-*.com/*
// @include https://*.*-amazon.com/*
// @exclude */cart/*
// @exclude */buy/*
// @version 1.3.0
// @grant none
// @run-at document-start
// ==/UserScript==
/*
[update]
Much less CPU usage especialy on internal ads.
[memo]
.com/.co.jp
top: interval さまざま多数, timeout インタラクションのみで定常なし
iframe: interval なし, timeout 定常 100ms が iframe ごとに1つずつ
*/
(function(){
const SCRIPTID = 'AmazonCpuTamer';
console.log(SCRIPTID, location.href);
const TAMEDINTERVAL = 60*1000;/* a bunch of intervals does cost so much even if the processes do nothing */
const QUICKRESPONSE = 1*1000;/* some of the interactions need rather quick response such as video guides */
const IFRAMETIMEOUT = 1*1000;/* amazon uses timeouts instead of intervals on iframes */
/* tame quick intervals */
const originalSetInterval = window.setInterval.bind(window);
window.setInterval = function(f, interval, ...args){
if(interval < TAMEDINTERVAL){
console.log(SCRIPTID, 'interval:', interval, 'to', TAMEDINTERVAL, location.href);
interval = TAMEDINTERVAL;
window.setTimeout(f, QUICKRESPONSE, ...args);
}
return originalSetInterval(f, interval, ...args);
};
/* tame quick timeouts on iframe ads */
if(window !== top){
const originalSetTimeout = window.setTimeout.bind(window);
window.setTimeout = function(f, timeout, ...args){
if(document.hidden) return;
if(timeout < IFRAMETIMEOUT){
console.log(SCRIPTID, 'timeout:', timeout, 'to', IFRAMETIMEOUT, location.href);
timeout = IFRAMETIMEOUT;
}
return originalSetTimeout(f, timeout, ...args);
};
}
/* add an associate tag */
switch(location.host){
case('www.amazon.com'):
addTag('knoa-20');
break;
case('www.amazon.co.uk'):
addTag('knoa-21');
break;
case('www.amazon.co.jp'):
addTag('knoa-22');
break;
}
function addTag(tag){
const url = new URL(location.href);
if(url.searchParams.get('tag') !== null) return;/* do not overwrite */
console.log(SCRIPTID, 'associate tag:', tag);
document.documentElement.addEventListener('mousedown', function(e){
for(let target = e.target; target; target = target.parentNode){
if(target.href && target.href.startsWith(location.origin)){
const separator = (target.href.includes('?')) ? '&' : '?';
target.href = target.href + separator + 'tag=' + tag;
}
}
});
const separator = (url.search === '') ? '?' : '&';
history.replaceState(null, document.title, location.href + separator + 'tag=' + tag);
}
})();