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#WEBTOOLS APP HOW TO#
#WEBTOOLS APP CODE#

Here are some core features and metrics you should check with browser tools: You may want to use an Incognito (Private) window, so that you don't have to worry about disabling the browser cache or removing previously cached entries. If you already do caching via a service worker, clear Cache API storage.

#WEBTOOLS APP HOW TO#

There's more information below about how to save and share test results.īefore you begin auditing network usage, make sure to disable the browser cache to ensure you get accurate statistics for first-load performance. For network requests, that can be as simple as a screenshot - you can also save profile data as a JSON file. Remember to keep a record of results before you make changes. Similar tools are available for Firefox, Safari, Internet Explorer and Edge. If you're not sure how to do this, work through the Chrome DevTools network panel Get Started Guide. Record resource requests: number, size, type and timing #Ī good place to start when auditing a site is to check pages with your browser's network tools. Optimizing 'hero images' such as banners and backgrounds is an easy, one-off win. Remove redundant images! If you can't get rid of them, optimize: increase compression as much as possible, reduce pixel dimensions, and use the format that gives you the smallest file sizes. Bloated images are also problematic for users on capped data plans. With images on mobile - especially on low-spec devices - memory can become the new bottleneck. Likewise for memory: small increases in pixel dimensions result in big increases in memory usage. Even just to render images takes power – and this is proportional to the size and quantity of images. Images also consume power: more image requests, more radio usage, more flat batteries. Latency gets worse as connectivity gets worse so excessive image file requests are an increasing problem as the web goes mobile. Images constitute by far the most weight and most requests for most web pages.

Metrics provided by servers and business systemsīelow you'll learn which approach is relevant for each type of audit.

There is a wide range of tools and techniques for auditing websites: Look for JavaScript loaded in multiple versions, or libraries that could be avoided with minor refactoring. Check for excessive DOM size and scripts that run unnecessarily on first load. Find unused JavaScript and CSS with coverage tools. Reduce CPU load Mobile devices have limited CPU, especially low-spec devices Check for heavy JavaScript. Optimize memory usage Memory can become the new bottleneck, especially on mobile devices Use the Chrome Task Manager to compare your site against others for memory usage when loading the home page and using other site features. For example: files that are loaded repeatedly, JavaScript that is loaded in multiple versions, CSS that is never used, images that are never viewed (or could be lazy loaded).

Improve serving performance, reliability and resilience Look for excessive or unnecessary requests for any type of resource.

#WEBTOOLS APP CODE#

Find images that could be lazy loaded, and check for unused code with coverage tools. Check file sizes to find bloated images, media, HTML, CSS and JavaScript.

Improve serving performance, reliability and resilience Set a page weight budget: for example, first load under 400 kB.

Reduce web app storage requirements - particularly important for users on low-spec devices.

Reduce data cost for users with capped data plans.

Set goals for time to interactive and payload size: for example TTI on 3G. Improve load performance 53% of users abandon sites that take longer than three seconds to load JavaScript and CSS that could be loaded asynchronously or deferred. Objective Why? What to test for? Ensure privacy, security and data integrity, and enable powerful API usage Why HTTPS Matters HTTPS implemented for all site pages/routes and assets. There are several core objectives for building a performant, resilient site with low data cost.įor each objective, you need an audit.

Real-world experience: screen and video recording.

Use analytics, event tracking and business metrics to track real-world performance.

Test for core Progressive Web App requirements.

Test first and subsequent load performance.Record resource requests: number, size, type and timing.