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YouTube Performance Booster (Fixed UI)

Optimizes YouTube performance without breaking UI elements

// ==UserScript==
// @name         YouTube Performance Booster (Fixed UI)
// @version      2.1
// @description  Optimizes YouTube performance without breaking UI elements
// @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';
    
    // ===== SAFE CONFIGURATION =====
    const settings = {
        instantNavigation: true,      // Smoother navigation
        disableAnimations: true,      // Disable UI animations
        qualityPreset: 'auto',        // Video quality (auto, 1080p, 720p etc)
        hideShorts: true              // Only hides Shorts shelf
    };

    // ===== SAFE CSS INJECTION =====
    GM_addStyle(`
        /* Animation removal (safe) */
        [no-animations] * {
            transition: none !important;
            animation: none !important;
        }
        
        /* Non-destructive hiding */
        [hide-shorts] ytd-rich-section-renderer {
            display: none !important;
        }
        
        /* Layout-safe optimizations */
        html {
            scroll-behavior: auto !important;
        }
    `);

    // Apply settings
    document.documentElement.setAttribute('no-animations', '');
    if (settings.hideShorts) {
        document.documentElement.setAttribute('hide-shorts', '');
    }

    // ===== SAFE PERFORMANCE OPTIMIZATIONS =====
    function optimizePlayer() {
        const player = document.querySelector('video');
        if (player) {
            player.addEventListener('canplay', function() {
                try {
                    if (settings.qualityPreset !== 'auto') {
                        player.setPlaybackQuality(settings.qualityPreset);
                    }
                } catch(e) { /* Fail silently */ }
            });
        }
    }

    // ===== SAFE INSTANT NAVIGATION =====
    if (settings.instantNavigation) {
        document.addEventListener('mouseover', function(e) {
            const link = e.target.closest('a[href^="/watch"]');
            if (link) {
                const preload = document.createElement('link');
                preload.rel = 'prefetch';
                preload.href = link.href;
                document.head.appendChild(preload);
            }
        }, {passive: true});
    }

    // Initialize
    const observer = new MutationObserver(optimizePlayer);
    observer.observe(document, {
        childList: true,
        subtree: true
    });
    window.addEventListener('load', optimizePlayer);
})();