Optimal settings for performance on "Project Gantt"

Hello User Community

I am using the project gantt widget for scheduling and re-arranging tasks on the Cloud environment (22x). However each time that I am doing this, the project gantt chart needs to save and load again for roughly ~7-10 sec after each operations. This is rather long in my opinion. My project is roughly ~400 lines long and includes 2 sub-projects.

Are there some settings in the browser which I would need to modify in order to increase performance of this widget?

I am using the latest ESR build from Firefox.

Many thanks!