Improves performance on Amazon pages by throttling background tasks and pausing off-screen iframe rendering.
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// ==UserScript==
// @name Amazon Page Smoother
// @namespace http://tampermonkey.net/
// @version 0.0.1
// @description Improves performance on Amazon pages by throttling background tasks and pausing off-screen iframe rendering.
// @license BSL-1.0
// @author VeleSila
// @match https://www.amazon.com/*
// @match https://www.amazon.co.jp/*
// @match https://www.amazon.co.uk/*
// @match https://www.amazon.es/*
// @match https://www.amazon.fr/*
// @match https://www.amazon.de/*
// @match https://www.amazon.it/*
// @match https://www.amazon.ca/*
// @match https://www.amazon.com.au/*
// @exclude */cart/*
// @exclude */buy/*
// @grant none
// @run-at document-start
// ==/UserScript==
(function() {
'use strict';
// --- Configuration ---
const FOREGROUND_TICK_RATE_MS = 150;
const BACKGROUND_TICK_RATE_MS = 2000;
/**
* Consolidates multiple setInterval calls into a single, more efficient loop.
*/
function initializeTimerThrottler() {
if (window.self !== window.top) {
return; // Only run in the top-level window
}
const nativeSetInterval = window.setInterval;
const nativeClearInterval = window.clearInterval;
let nextTaskId = 1;
const scheduledTasks = {}; // Using a plain object for the task queue
// Override the browser's default setInterval function
window.setInterval = (callback, delay, ...args) => {
if (typeof callback !== 'function') {
// For non-function callbacks (e.g., strings), use the native function
return nativeSetInterval(callback, delay, ...args);
}
const id = nextTaskId++;
scheduledTasks[id] = {
callback: () => callback(...args),
delay: Math.max(delay || 0, FOREGROUND_TICK_RATE_MS),
lastExecution: 0,
};
return id;
};
// Override the corresponding clearInterval function
window.clearInterval = (id) => {
if (scheduledTasks[id]) {
delete scheduledTasks[id];
} else {
nativeClearInterval(id);
}
};
const masterLoop = () => {
const now = performance.now();
const tickRate = document.hidden ? BACKGROUND_TICK_RATE_MS : FOREGROUND_TICK_RATE_MS;
for (const id in scheduledTasks) {
const task = scheduledTasks[id];
if (now - task.lastExecution >= task.delay) {
try {
task.callback();
task.lastExecution = now;
} catch (error) {
console.error("Error in throttled task:", error);
delete scheduledTasks[id]; // Remove faulty task
}
}
}
setTimeout(masterLoop, tickRate);
};
// Start the master loop
setTimeout(masterLoop, FOREGROUND_TICK_RATE_MS);
}
/**
* Pauses rendering for iframes that are not currently visible on screen.
*/
function initializeIframeManager() {
if (window.self !== window.top) {
return;
}
const visibilityWatcher = new IntersectionObserver(
(entries) => {
for (const entry of entries) {
entry.target.style.contentVisibility = entry.isIntersecting ? 'visible' : 'hidden';
}
}, { root: null, threshold: 0 }
);
const domWatcher = new MutationObserver((mutations) => {
for (const mutation of mutations) {
for (const node of mutation.addedNodes) {
if (node.nodeType === Node.ELEMENT_NODE) {
if (node.tagName === 'IFRAME') {
visibilityWatcher.observe(node);
} else {
node.querySelectorAll('iframe').forEach(iframe => visibilityWatcher.observe(iframe));
}
}
}
}
});
const startManaging = () => {
document.querySelectorAll('iframe').forEach(iframe => visibilityWatcher.observe(iframe));
domWatcher.observe(document.body, { childList: true, subtree: true });
};
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', startManaging, { once: true });
} else {
startManaging();
}
}
// --- Script Execution ---
initializeTimerThrottler();
initializeIframeManager();
})();