Hi Cornel,
Thank you for contacting Syncfusion support.
Currently, there is no default option to filter the resources like as we do for appointments using load on demand feature, but this can be done – if we once implemented the virtual scrolling support for resources (as it will improve the performance of loading resources based on specific count assigned for simultaneous scrolling). We have added this feature namely “Virtual Scrolling for Resources” to our feature request list and will consider this with high priority for main release Volume – 3, 2017 which is expected to be rolled out by the end of August month 2017.
We appreciate your valuable patience until then.
Regards,
Karthigeyan