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This script optimizes YouTube's performance by modified configs and much more!
// ==UserScript==
// @name YouTube Web Tweaks
// @version 4.2.9
// @description This script optimizes YouTube's performance by modified configs and much more!
// @author Magma_Craft
// @license MIT
// @match *://www.youtube.com/*
// @namespace https://greasyfork.org/en/users/933798
// @icon https://www.youtube.com/favicon.ico
// @unwrap
// @run-at document-end
// @unwrap
// @grant none
// ==/UserScript==
// Enable strict mode to catch common coding mistakes
"use strict";
// Define the flags to assign to the EXPERIMENT_FLAGS object
const flagsToAssign = {
// Standard tweaks (YT config editor + Disable animations)
IS_TABLET: true,
DISABLE_YT_IMG_DELAY_LOADING: true,
polymer_verifiy_app_state: false,
desktop_delay_player_resizing: false,
web_animated_actions: false,
web_animated_like: false,
web_animated_like_lazy_load: false,
render_unicode_emojis_as_small_images: true,
smartimation_background: false,
kevlar_refresh_on_theme_change: false,
// Disable cinematics (aka ambient lighting)
kevlar_measure_ambient_mode_idle: false,
kevlar_watch_cinematics_invisible: false,
web_cinematic_theater_mode: false,
web_cinematic_fullscreen: false,
enable_cinematic_blur_desktop_loading: false,
kevlar_watch_cinematics: false,
web_cinematic_masthead: false,
web_watch_cinematics_preferred_reduced_motion_default_disabled: false
};
const updateFlags = () => {
// Check if the EXPERIMENT_FLAGS object exists in the window.yt.config_ property chain
const expFlags = window?.yt?.config_?.EXPERIMENT_FLAGS;
// If EXPERIMENT_FLAGS is not found, exit the function
if (!expFlags) return;
// Assign the defined flags to the EXPERIMENT_FLAGS object
Object.assign(expFlags, flagsToAssign);
};
// Create a MutationObserver that calls the updateFlags function when changes occur in the document's subtree
const mutationObserver = new MutationObserver(updateFlags);
mutationObserver.observe(document, { subtree: true, childList: true });
// Other tweaks to be added
(function() {
let css = `
/* Hide ads, shorts, etc using CSS */
.ytd-search ytd-shelf-renderer, ytd-reel-shelf-renderer, ytd-merch-shelf-renderer, ytd-action-companion-ad-renderer, ytd-display-ad-renderer, ytd-rich-section-renderer, ytd-video-masthead-ad-advertiser-info-renderer, ytd-video-masthead-ad-primary-video-renderer, ytd-in-feed-ad-layout-renderer, ytd-ad-slot-renderer, ytd-statement-banner-renderer, ytd-banner-promo-renderer-background ytd-ad-slot-renderer, ytd-in-feed-ad-layout-renderer, .ytwPanelAdHeaderImageLockupViewModelHost, ytd-ads-engagement-panel-content-renderer, #content.ytd-ads-engagement-panel-content-renderer, ytd-engagement-panel-section-list-renderer[target-id="engagement-panel-ads"], ytd-rich-item-renderer:has(> #content > ytd-ad-slot-renderer), .ytd-video-masthead-ad-v3-renderer, div#root.style-scope.ytd-display-ad-renderer.yt-simple-endpoint, div#sparkles-container.style-scope.ytd-promoted-sparkles-web-renderer, div#main-container.style-scope.ytd-promoted-video-renderer, div#player-ads.style-scope.ytd-watch-flexy, #clarify-box, ytm-rich-shelf-renderer, ytm-search ytm-shelf-renderer, ytm-button-renderer.icon-avatar_logged_out, ytm-companion-slot, ytm-reel-shelf-renderer, ytm-merch-shelf-renderer, ytm-action-companion-ad-renderer, ytm-display-ad-renderer, ytm-rich-section-renderer, ytm-video-masthead-ad-advertiser-info-renderer, ytm-video-masthead-ad-primary-video-renderer, ytm-in-feed-ad-layout-renderer, ytm-ad-slot-renderer, ytm-statement-banner-renderer, ytm-banner-promo-renderer-background ytm-ad-slot-renderer, ytm-in-feed-ad-layout-renderer, ytm-rich-item-renderer:has(> #content > ytm-ad-slot-renderer) .ytm-video-masthead-ad-v3-renderer, div#root.style-scope.ytm-display-ad-renderer.yt-simple-endpoint, div#sparkles-container.style-scope.ytm-promoted-sparkles-web-renderer, div#main-container.style-scope.ytm-promoted-video-renderer, div#player-ads.style-scope.ytm-watch-flexy, ytm-pivot-bar-item-renderer:has(> .pivot-shorts), ytd-compact-movie-renderer, yt-about-this-ad-renderer, masthead-ad, ad-slot-renderer, yt-mealbar-promo-renderer, statement-banner-style-type-compact, ytm-promoted-sparkles-web-renderer, tp-yt-iron-overlay-backdrop, #masthead-ad, #endpoint.yt-simple-endpoint.ytd-guide-entry-renderer.style-scope[title="Shorts"], a.yt-simple-endpoint.style-scope.ytd-mini-guide-entry-renderer[title="Shorts"] {
display: none !important
}
.style-scope[page-subtype='channels'] ytd-shelf-renderer,
.style-scope[page-subtype='channels'] ytm-shelf-renderer {
display: block !important;
}
ytd-watch-metadata.ytd-watch-flexy {
padding-bottom: 36px !important;
}`;
if (typeof GM_addStyle !== "undefined") {
GM_addStyle(css);
} else {
let styleNode = document.createElement("style");
styleNode.appendChild(document.createTextNode(css));
(document.querySelector("head") || document.documentElement).appendChild(styleNode);
}
})();