Decreasing the number of events that need to be rendered will improve the loading time.
You can also review a new feature, made available with the latest release, aimed at improving the performance for large amount of events - Virtual vertical grouping:
The Vertical Virtualization optimizes the views' rendering by doing a DOM virtualization. It is, however, supported only for Day, Week, WorkWeek, and Month views, but not the Agenda view.
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