Hello Nils,
Sorry for the inconvenience caused.
Syncfusion Components will supported in both server and client side. Currently Calendar, DatePicker and TimePicker Components are Hybrid components. The reported issue “ 100 ms delay in rendering the component” will not occur. But the DateTimePicker and DateRangePicker components are non-Hybrid. So, the reported issue is reproduced in our end and we have already logged as a feature request. The fix for “delay in rendering component” will be included in Hybrid DateTimePicker support, which is expected to be included in Volume 2 release, rolled out on end of June 2020.
You can track the status of the feature in the below feedback link. We appreciate your patience until then.
Regards,
Ponmani M