|Language:||English, Spanish, French|
|Distribution:||Free* [*Registration needed]|
We could also go beyond the bundle size budget though. Tools such as Calibre , SpeedCurve and Bundlesize can help you keep your budgets in check, and can be integrated into your build process. Performance budgets should adapt depending on the network conditions for an average mobile device. Stick to your environment for building, be it Grunt, Gulp, Webpack, Parcel, or a combination of tools. Among the build tools, Webpack seems to be the most established one, with literally hundreds of plugins available to optimize the size of your builds.
Getting started with Webpack can be tough though. Both of them are great introductions for diving into Webpack.
Webpack Fundamentals is a very comprehensive 4h course with Sean Larkin, released by FrontendMasters. Webpack examples has hundreds of ready-to-use Webpack configurations, categorized by topic and purpose.
Bonus: there is also a Webpack config configurator that generates a basic configuration file. Use progressive enhancement as a default. Keeping progressive enhancement as the guiding principle of your front-end architecture and deployment is a safe bet. Design and build the core experience first, and then enhance the experience with advanced features for capable browsers, creating resilient experiences.
If your website runs fast on a slow machine with a poor screen in a poor browser on a sub-optimal network, then it will only run faster on a fast machine with a good browser on a decent network. Choose a strong performance baseline. With the performance bottlenecks moving away from the server to the client , as developers, we have to consider all of these unknowns in much more detail.
The first render tends to warm up a bunch of lazily compiled code, which a larger tree can benefit from when it scales. The second render is basically an emulation of how code reuse on a page affects the performance characteristics as the page grows in complexity.
Evaluate each framework and each dependency. Now, not every project needs a framework and not every page of a single-page-application needs to load a framework. It might sound obvious but worth stating: some projects can also benefit benefit from removing an existing framework altogether. Inian Parameshwaran has measured performance footprint of top 50 frameworks against First Contentful Paint — the time from navigation to the time when the browser renders the first bit of content from the DOM.
You could examine your framework candidates and the proposed architecture, and study how most solutions out there perform, e. Baseline performance cost matters. According to a study by Ankur Sethi , "your React application will never load faster than about 1. Your Angular app will always take at least 2. The users of your Vue app will need to wait at least 1 second before they can start using it. In exchange, your team gains maintainability and developer efficiency, of course. But this consideration needs to be deliberate.
A good starting point is to choose a good default stack for your application.
When building a web app, look into the PRPL pattern and application shell architecture. The idea is quite straightforward: Push the minimal code needed to get interactive for the initial route to render quickly, then use service worker for caching and pre-caching resources and then lazy-load routes that you need, asynchronously.
PRPL stands for Pushing critical resource, Rendering initial route, Pre-caching remaining routes and Lazy-loading remaining routes on demand. Have you optimized the performance of your APIs?
APIs are communication channels for an application to expose data to internal and third-party applications via so-called endpoints. When designing and building an API , we need a reasonable protocol to enable the communication between the server and third-party requests. Representational State Transfer REST is a well-established, logical choice: it defines a set of constraints that developers follow to make content accessible in a performant, reliable and scalable fashion. As with good ol' HTTP requests, when data is retrieved from an API, any delay in server response will propagate to the end user, hence delaying rendering.
When a resource wants to retrieve some data from an API, it will need to request the data from the corresponding endpoint. A component that renders data from several resources, such as an article with comments and author photos in each comment, may need several roundtrips to the server to fetch all the data before it can be rendered. Furthermore, the amount of data returned through REST is often more than what is needed to render that component.
GraphQL provides a performant solution to these issues.
Per se, GraphQL is a query language for your API, and a server-side runtime for executing queries by using a type system you define for your data.
For content-heavy websites that are dealing with a lot of third-party content, these options could potentially help speed up render times dramatically. Unless they don't.
AMP is not what makes the biggest difference from a performance perspective. Obviously, a presence in a walled garden places developers in a position to produce and maintain a separate version of their content, and in case of Instant Articles and Apple News without actual URLs thanks Addy, Jeremy! Choose your CDN wisely.
Depending on how much dynamic data you have, you might be able to "outsource" some part of the content to a static site generator , pushing it to a CDN and serving a static version from it, thus avoiding database requests. You could even choose a static-hosting platform based on a CDN, enriching your pages with interactive components as enhancements JAMStack.
In fact, some of those generators like Gatsby on top of React are actually website compilers with many automated optimizations provided out of the box. As compilers add optimizations over time, the compiled output gets smaller and faster over time. Notice that CDNs can serve and offload dynamic content as well.
So, restricting your CDN to static assets is not necessary. Double-check whether your CDN performs compression and conversion e. Assets Optimizations Use Brotli or Zopfli for plain text compression. In , Google introduced Brotli , a new open-source lossless data format, which is now supported in all modern browsers. In practice, Brotli appears to be much more effective than Gzip and Deflate.
It might be very slow to compress, depending on the settings, but slower compression will ultimately lead to higher compression rates.
Still, it decompresses fast. You can also estimate Brotli compression savings for your site. At the highest level of compression, Brotli is so slow that any potential gains in file size could be nullified by the amount of time it takes for the server to begin sending the response as it waits to dynamically compress the asset.
With static compression, however, higher compression settings are preferred. The catch is that files will take around 80 times longer to compress. The strategy? Make sure that the server handles content negotiation for Brotli or gzip properly. Use responsive images and WebP.
I have a really great idea. Where is the best place to record it? You can contact the developers on our IRC channel pdfjs on irc. The issue tracking system is designed to record a single technical problem. The GitHub issue tracker is not a good place for general, not well thought out or unworkable ideas. Most likely a discussion-type issue will not be addressed for a long time or closed as invalid.
I'm developing a custom solution based on PDF. Can you help me? If this does not help, please prepare short well-documented example that demonstrates the problem and make it accessible online on your website, JSBin, etc. I want to render all pages in a document at a high resolution. Is it a good idea? Not really. This requires you to allocate 3. You need a decent amount of memory to hold the canvases, and it does not count the time that is spent on rendering them.
The demo viewer creates, renders, and holds canvases only for visible pages to reduce the amount of used memory. Our recommendation is to create and render only visible pages.
There are two back-ends, canvas and SVG. Which one should I use? You should use the default, which is the canvas back-end, since it is stable and supported. The SVG back-end is experimental and is not feature complete. The advantage of the SVG back-end is rendering quality, but the disadvantage is that it's currently slower than the canvas back-end.
Can it fetch only the required portions for rendering? Actually, PDF. PDF is a complicated format; in most of the cases, the vital data of a PDF document is located at the end.
What is the latest stable version of PDF. It is included in a number of projects such as Firefox, a Chromium extension, et cetera. We are recording changes to the library with GitHub pull requests. The changelog is also available from the Git log. The version number consists of three digits: the major release number, minor release number and build number.