Dan Shappir

JavaScript uses Garbage Collection (GC) for memory management. As a result, many developers that use JavaScript based systems, such as NodeJS, assume that they’re free of memory issues. Unfortunately this is incorrect, and many NodeJS-based services suffer from memory management problems such as leaks and excessive GC CPU cost. But finding, understanding, and resolving memory issues can be very challenging, because a problem in any part of the application impacts the application as a whole. Also, they may only manifest under load, in production environments. In this session I will explain how to find and fix such issues using the heap dump feature that is built into NodeJS. And I will show how to use the DevTools memory panel to analyze such dumps.

JavaScript uses Garbage Collection (GC) for memory management. As a result, many developers that use JavaScript based systems, such as NodeJS, assume that they’re free of memory issues. Unfortunately this is incorrect, and many NodeJS-based services suffer from memory management problems such as leaks and excessive GC CPU cost. But finding, understanding, and resolving memory issues can be very challenging, because a problem in any part of the application impacts the application as a whole. Also, they may only manifest under load, in production environments. In this session I will explain how to find and fix such issues using the heap dump feature that is built into NodeJS. And I will show how to use the DevTools memory panel to analyze such dumps.

Google collects performance information from all sessions on opted-in Chrome browsers into its Chrome User Experience Report (CrUX) database. It then uses this information as a ranking factor for its search engine, but it also makes this information publicly available for everyone to view. I used this data to analyze and compare the performance of the leading JavaScript frameworks. In particular, I looked at the likelihood that websites built using each framework will have good Core Web Vitals (CWV) scores. Along the way I encountered several surprising results, and solved at least one mystery. See how your favorite framework ranks vs all the rest!