Most WordPress plugins shouldn’t run on all pages. For example during AJAX requests usually you need to enable only one plugin which serve the request.
With Shifty you can disable plugins on specific pages, or devices, for specific user roles or post types, etc.
You can overwrite CSS/JS files separately for every page, post types, user roles, device, etc. Remove unused codes, or change anything you need.
Preload important static files and improve Web Vital scores with Shifty. You can preload CSS, JS, images, video, audio and documents as well.