Oh The Scripts We'll Load - A Performance Talk by Tim Kadlec

Discover how to optimize page loading and rendering with script loading techniques, from default script elements to async, defer, and preload scripts, and explore the impact of resource priority on user experience.

Key takeaways

The default script element can cause issues with page loading and rendering if not handled correctly.
The browser’s parser is blocked when it encounters a script element, which can lead to poor user experience.
Async scripts do not guarantee loading order.
Defer scripts can be used to ensure script loading after page parsing is complete.
Preload scripts can be used to prioritize JavaScript files.
The preload attribute can be used in conjunction with defer to prioritize JavaScript files.
Server-side rendering can help in improving page loading and rendering.
The defer attribute is like the nuclear option when it comes to script loading.
The priority of resources on the network can affect page loading and rendering.
The order in which resources are requested on the network can affect page loading and rendering.
The browser’s parser is affected by the loading of resources on the network.
The priority of resources on the network can affect the loading order of resources.
The priority of resources on the network can affect the rendering of the page.
Browsers have a look ahead or speculative parsing mechanism that can help in improving page loading and rendering.
The defer attribute can be used to load scripts after page parsing is complete and before the page is rendered.
The preload attribute can be used to prioritize JavaScript files and ensure that they are loaded before page rendering.
The browser’s main thread is affected by the loading of resources on the network.
The browser’s main thread is affected by the rendering of the page.
JavaScript can block the browser’s parser and rendering of the page.
JavaScript can be used to dynamically inject scripts into the page.
The async attribute can be used to specify that a script should be loaded in parallel with the page parsing and rendering.
The defer attribute can be used to specify that a script should be loaded after page parsing is complete and before the page is rendered.
The preload attribute can be used to specify that a script should be prioritized and loaded before page rendering.
The browser’s parser is responsible for constructing the document object model (DOM).
The browser’s render is responsible for rendering the page based on the DOM.
The main thread is responsible for processing the rendering of the page.
The browser’s network priority can affect the loading order of resources.
The browser’s rendering priority can affect the rendering of the page.
The browser’s main thread can affect the loading and rendering of the page.
The defer attribute can be used to ensure that a script is loaded after page parsing is complete and before the page is rendered.
The preload attribute can be used to ensure that a script is prioritized and loaded before page rendering.
The async attribute can be used to specify that a script should be loaded in parallel with the page parsing and rendering.
Server-side rendering can help in improving page loading and rendering.
JavaScript can be used to dynamically inject scripts into the page.
The defer attribute can be used to specify that a script should be loaded after page parsing is complete and before the page is rendered.
The preload attribute can be used to specify that a script should be prioritized and loaded before page rendering.

Oh The Scripts We'll Load - A Performance Talk by Tim Kadlec

More talks