Kong Insomnia 9.3.3 introduces significant performance enhancements without adding new functionalities, following the recent 9.3.x series that brought features like full scripting, global environments, and folder-level configuration. This update emphasizes improved user experience by boosting performance up to 20 times for operations such as application startup and project switching, resulting in reduced latency and a smoother workflow. The release also introduces usability improvements, such as remembering the last open files across restarts and enhancing sidebar interactions, including easier renaming and a more intuitive contextual menu. These "quality of life" updates aim to streamline daily API workflows, making Insomnia more convenient and efficient for users.