Optimizes YouTube for maximum performance with faster loading and instant navigation
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// ==UserScript==
// @name YouTube Performance Booster
// @version 1.2
// @description Optimizes YouTube for maximum performance with faster loading and instant navigation
// @author HYPERR.
// @match *://*.youtube.com/*
// @grant GM_addStyle
// @grant GM_setValue
// @grant GM_getValue
// @run-at document-start
// @license MIT
// @namespace https://greasyfork.org/users/1476487
// ==/UserScript==
(function() {
'use strict';
// Performance optimization settings
const settings = {
instantNavigation: true,
aggressivePrefetch: true,
disableComments: false,
disableRelatedVideos: false,
disableNotifications: true,
disableAnimations: true,
lightTheme: false,
qualityPreset: 'auto' // auto, 720p, 480p, 360p
};
// Apply CSS optimizations immediately
GM_addStyle(`
/* Disable animations and transitions */
ytd-app[disable-animations] * {
transition: none !important;
animation: none !important;
scroll-behavior: auto !important;
}
/* Hide non-essential elements */
ytd-app[disable-comments] #comments,
ytd-app[disable-related] #related,
ytd-app[disable-notifications] #notification-preference-button,
ytd-app[disable-notifications] .notification-topbar-button {
display: none !important;
}
/* Light theme optimization */
ytd-app[light-theme] {
--yt-spec-general-background-a: #ffffff !important;
--yt-spec-base-background: #f8f9fa !important;
--yt-spec-menu-background: #ffffff !important;
}
/* Performance-focused layout */
#secondary.ytd-watch-flexy {
display: none !important;
}
#primary.ytd-watch-flexy {
max-width: 100% !important;
}
/* Remove visual fluff */
ytd-masthead[is-focused] #container.ytd-masthead,
ytd-thumbnail-overlay-time-status-renderer,
.ytp-ce-element {
opacity: 0.8 !important;
}
`);
// Feature toggles from settings
const app = document.querySelector('ytd-app') || document.documentElement;
if (settings.disableAnimations) app.setAttribute('disable-animations', '');
if (settings.disableComments) app.setAttribute('disable-comments', '');
if (settings.disableRelatedVideos) app.setAttribute('disable-related', '');
if (settings.disableNotifications) app.setAttribute('disable-notifications', '');
if (settings.lightTheme) app.setAttribute('light-theme', '');
// Instant Navigation System
if (settings.instantNavigation) {
let lastHoveredLink = null;
let hoverTimer = null;
const NAV_DELAY = 100; // ms
document.addEventListener('mouseover', function(e) {
const link = e.target.closest('a');
if (!link || !link.href || link.href === lastHoveredLink) return;
clearTimeout(hoverTimer);
lastHoveredLink = link.href;
hoverTimer = setTimeout(() => {
if (settings.aggressivePrefetch) {
// Prefetch resources for instant loading
fetch(link.href, {
method: 'HEAD',
mode: 'cors',
cache: 'force-cache'
});
}
// Preload for instant navigation
const preload = document.createElement('link');
preload.rel = 'preload';
preload.as = 'document';
preload.href = link.href;
document.head.appendChild(preload);
}, NAV_DELAY);
}, {capture: true, passive: true});
document.addEventListener('click', function(e) {
const link = e.target.closest('a');
if (link && link.href) {
e.preventDefault();
window.location.href = link.href;
}
}, {capture: true});
}
// Performance optimization functions
function optimizePlayer() {
const player = document.querySelector('video');
if (!player) return;
// Set quality preferences
const qualityMap = {
'auto': 'default',
'720p': 'hd720',
'480p': 'large',
'360p': 'medium'
};
const preferredQuality = qualityMap[settings.qualityPreset] || 'default';
try {
player.setPlaybackQualityRange(preferredQuality);
} catch(e) {
console.log('YT Performance: Quality setting unavailable');
}
// Player performance tweaks
player.preload = 'auto';
player.playsInline = true;
player.disablePictureInPicture = true;
}
function optimizePage() {
// Remove non-critical elements
const elementsToRemove = [
'ytd-comments',
'ytd-watch-next-secondary-results-renderer',
'ytd-rich-item-renderer:has([overlay-style="SHORTS"])',
'#secondary',
'#masthead-container',
'#player-ads'
];
elementsToRemove.forEach(selector => {
document.querySelectorAll(selector).forEach(el => {
if (el && el.parentNode) {
el.parentNode.removeChild(el);
}
});
});
// Disable resource-heavy features
if ('requestIdleCallback' in window) {
requestIdleCallback(() => {
// Disable chat if present
const liveChat = document.querySelector('ytd-live-chat-frame');
if (liveChat) liveChat.remove();
// Disable JS animations
document.body.classList.add('no-animations');
});
}
}
// MutationObserver to apply optimizations as page changes
const observer = new MutationObserver(mutations => {
optimizePlayer();
optimizePage();
});
observer.observe(document, {
childList: true,
subtree: true,
attributes: false
});
// Initialize optimizations
window.addEventListener('load', () => {
optimizePlayer();
optimizePage();
// Set up service worker for caching (if supported)
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('sw.js')
.then(reg => console.log('YT Performance: Service worker registered'))
.catch(err => console.log('YT Performance: Service worker failed', err));
}
});
// Console info
console.log('YouTube Performance Booster is active!');
console.log('Settings:', settings);
})();