[meta] Drupal CMS 2.0 performance issues

Problem/Motivation

Opening this to have an overview of issues found via performance testing of Drupal CMS 2.0. Many of these will be in dependencies rather than Drupal CMS itself.

Drupal CMS recipes

Blog blocks load views AJAX library #3553276: Blog view enables views ajax for pagerless blocks / #3553279: Views AJAX is library is loaded for displays with no AJAX plugins

Mercury

Mercury JavaScript size / chaining #3553269: navbar JavaScript page weight/network chaining issues

Mercury font preloading: #3553270: Fonts should be preloaded

Byte 404: #3565618: Byte font preloading causes a 404

Mercury webform CSS loading: #3553280: webform-newsletter.css is loaded on every page / #3552020: Simplify newsletter component / #3554413: Exclude main.min.css from preprocessing and minification

Byte recipe / Canvas

Byte / Canvas images should modern image formats: #3553268: Use avif/webp image styles / #3546111: Update image rendering to use the Canvas responsive image

#3565620: Large image loaded from component on front page

Canvas adding js for anonymous users #3565616: Front-end performance: only attach track_navigation asset library for users that can access the Canvas UI

Trash module

Trash module unnecessary CSS #3553272: Trash library is added to the page even if the navigation bar won't be shown

Webform

Webform details library loads jQuery on Byte's front page: #3553278: Try to load details library only when details element is present

Canvas

Component field makes everything uncacheable #3554324: ComponentTreeItemList makes all content uncacheable

ComponentTreeItemList rendering is expensive #3554315: Optimize (and possibly static cache) ComponentTreeItemList::toRenderable()

Steps to reproduce

Proposed resolution

User interface changes

Configuration changes