Hi Robert,
We have checked with simple SfCalendar sample. In the sample, we were unable to reproduce 5sec delay while loading at initial in SfCalendar. But we have faced extra 1.3sec delay while comparing to earlier version, currently we are analyzing initial loading. We have attached sample for your reference. Please download the sample from the following link.
Please look at the sample, please update if we need to add any property to reproduce this issue or which device you are test on this? It would be helpful for us to proceed further on this.
Regards,
Mariappan S.