8/11/2023 0 Comments Stackoverflow down![]() ![]() These are practices that make for code that’s easy to read and maintain. In software engineering, a number of fairly non-controversial best practices have evolved over the years, which include decoupled modules, cohesive code, and automated testing. It’s a sign of the company maturing and our engineering division re-assessing its goals and priorities to better suit the business that we’re building for. Paying the accumulated tech debt takes time, but it’s already helping us get to more reliable and testable code. But now that we’re supporting paying customers, identifying bugs early on reduces the cost of fixing them, and therefore the cost of business. We got away with “testing in production” for a long time, largely due to our (very active) meta community. ![]() Our priorities have since steered towards testability. NET world, meaning we don’t have to focus as much on the raw performance of our application code. After successfully achieving that scale, much of the context has changed: we have a much faster base framework now, given all the latest improvements in the. We made some tough calls, and consciously decided to trade off testability for performance. Early on, scaling to millions of users was our main concern. Over the past 13 years, we have progressively changed priority as a business. Skip effects only until certain dependencies have changed if you are using the Effect hook to improve runtime performance.Update: I realize we didn’t add a lot of context here when telling the story of the engineering decisions we made years ago, and why we’re moving away from some of them now.Minimize unnecessary re-renders using shouldComponentUpdate, PureComponent, or mo.Use a "windowing" library like react-window to minimize the number of DOM nodes created if you are rendering many repeated elements on the page.If you're rendering large lists, use virtual scrolling with the Component Dev Kit (CDK). See Google's Reduce the Scope and Complexity of Style Calculations for more information. If you can't avoid a large DOM tree, another approach for improving rendering performance is simplifying your CSS selectors. If you create DOM nodes at runtime, Subtree Modification DOM Change Breakpoints can help you pinpoint when nodes get created. Perhaps you can remove the undisplayed nodes from the initially loaded document and only create them after a relevant user interaction, such as a scroll or a button click. If you're currently shipping a large DOM tree, try loading your page and manually noting which nodes are displayed. In general, look for ways to create DOM nodes only when needed, and destroy nodes when they're no longer needed. See the Lighthouse performance scoring post to learn how your page's overall performance score is calculated. Errors when the body element has more than ~1,400 nodes.Warns when the body element has more than ~800 nodes.Lighthouse flags pages with DOM trees that: Lighthouse reports the total DOM elements for a page, the page's maximum DOM depth, and its maximum child elements: # How the Lighthouse DOM size audit fails If your JavaScript uses general query selectors such as document.querySelectorAll('li'), you may be unknowingly storing references to a very large number of nodes, which can overwhelm the memory capabilities of your users' devices. A large DOM tree in combination with complicated style rules can severely slow down rendering. ![]() A large DOM tree can slow down your page performance in multiple ways:Ī large DOM tree often includes many nodes that aren't visible when the user first loads the page, which unnecessarily increases data costs for your users and slows down load time.Īs users and scripts interact with your page, the browser must constantly recompute the position and styling of nodes. ![]()
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