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I'm interested in these performance issues and in customising cell rendering in general, as I'm migrating a rostering app from pure native apps to using Xamarin Forms.
I suspect if you have major problems with making significant changes to the CalendarEventCollection that it is firing a change event every time and so some batch mechanism is needed, maybe suppress showing inline events whilst adding the items then toggle it back on. when you have finished your batch would help?
I also noticed that CalendarInlineEvent is a full Xamarin.Forms.View which seems a very heavy-weight class to be drawing in these quantities.
Just wondered whether anybody had made progress on this. We've built a Xamarin.Forms app with SfScheduler that has around 100 - 150 appointments per month and the performance is shockingly slow - it takes around 10 seconds to display a page when swipped in month view. I'm loading from local database when visible dates are changed but have also tried pre-loading many months of appointments and hence no loading new appointments when visible dates changed and that is no better. Seems a major problem rendering month view. Can Syncfusion supply a heavily populated sample project to download so I can see whether they do something I'm not doing.
Hope to hear from someone. Thanks Joth