![]() If you’re interested in a browser-based load testing solution, try LoadNinja today to see how easy it is to get started. But it’s always a good idea to load test to ensure quality as well. By profiling and optimizing JavaScript during development, developers can avoid many of them before they become a problem. JavaScript has become the de-facto programming language for the web, but with processing moving to the client side, it’s easy to miss performance issues. In addition to improving the user experience, these efforts can help you meet service level agreement (SLA) requirements and other business requirements. The combination of profiling, optimization, and load testing is the best way to maximize performance and eliminate bottlenecks. Load testing is the only way to catch performance bottlenecks that slip through the cracks before they’re deployed to production – but only if run as part of a continuous integration (CI) workflow. While this can help avoid problems, it’s never going to be a perfect solution that catches every issue. ![]() Keep performance in mind and you can avoid a lot of issues from occurring in the first place. The best way to avoid JavaScript performance issues is to encourage developers to use Google Chrome’s DevTools (or similar solutions) to profile and optimize JavaScript during development. Get the Ebook Putting the Pieces Together LoadNinja makes it easy to develop browser-based tests to measure JavaScript performance and identify bottlenecks. By measuring the time between the request and the final render, you have a much clearer picture of the user experience – especially for JavaScript-heavy apps. Of course, these tests fail to account for the time it takes a browser to load JavaScript, CSS, images and other assets.īrowser-based load tests overcome these issues by spinning up actual browser instances and measuring how long it takes them to fully render a response. They send a request to a server endpoint and measure the response time and other performance metrics. Most load testing solutions are protocol-based platforms, which means that they only test server endpoints. From there, you may want to look for ways to make the line of code more efficient to reduce the impact on page load. You can go to the exact line of JavaScript code causing an issue by clicking on the relevant file at the bottom of the Summary tab. If you click on a particular call, you can see how long it took to execute.Ĭhrome DevTools Script Overview – Source: Google The flame chart shows activity on the main CPU thread over time, where the X-Axis is time and the Y-Axis is the call stack. If you’re seeing a laggy UI or excessive CPU usage, you can debug performance issues in the Main section under the Performance tab. If you’re maxing out a browser’s CPU, find ways to cut down on the amount of work necessary because you could be slowing down the user’s device. ![]() CPU Chart: The CPU chart shows the browser’s CPU usage.When the framerate drops below acceptable levels, you’ll see a red bar rather than a green bar. FPS Chart: The Frames per Second (FPS) chart shows the performance of animations and should generally be 60 FPS.There are a couple of key metrics to watch: You can also throttle network speed to simulate mobile networks. For instance, you may want to set CPU to “2x slowdown” to mimic a mobile device if you’re on a high-powered laptop. Note: You can throttle Network or CPU resources in the top section of the Performance Tab. Chrome DevTools Performance Reports – Source: Google
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