Vue 3.5, the latest update to the popular “progressive” JavaScript framework, brings with it a host of exciting improvements, particularly in the platform’s reactivity system. These enhancements aim to enhance performance and optimize memory usage for a smoother development experience.

Unveiled in a recent announcement on September 1, Vue 3.5 has been touted as a minor release with no disruptive changes. However, one standout feature of this update is the major refactor of the reactivity system. According to Vue creator Evan You’s blog post, this refactor has not only improved performance but has also led to a significant reduction in memory usage by as much as 56%, all without altering any behaviors within the framework.

In addition to the reactivity system overhaul, Vue 3.5 addresses issues related to stale computed values and memory hang-ups caused by server-side rendering. Furthermore, reactivity tracking has been fine-tuned, particularly for large and deeply reactive arrays, resulting in operations being up to 10 times faster in some scenarios. Another noteworthy enhancement is the stabilization of reactive props destructure, which is now enabled by default. This means that variables destructured from a defineProps call in