Performance in Jira front-end: using modern bundles to improve load time

This post details the implementation of 'modern bundles' for Jira's frontend, which involves serving less transpiled JavaScript to modern browsers. It presents experimental results showing improvements in Time-to-Interactive (TTI) for both initial loads and SPA transitions, as well as a reduction in bundle size. The post also discusses expanding the definition of 'modern browsers' based on observed usage patterns and the impact of browserlist versioning.