Thank you for the provided screenshot.
Indeed, there isn't a functionality that would allow to render the group items with paging. The current layout of the Grid doesn't provide an option that would allow to change the Group layout to such extent. However, I can suggest two options for this case. One is to use the kendoGridGroupBinding directive as demonstrated in the following article of our documentation:
It requires that the complete data set is provided to the Grid and ensures that just a portion of the complete data set is loaded at once in the Grid, which ensures the smooth scrolling. However, some browser resource would still be required in order to compute the aggregates on the client.
The second option would be applicable if only one level grouping is required. In such case the master/detail Grid feature can be used as an alternative:
It allows to load the detail data for each master row only when the master row is expanded. The detail row template can then be configured to use another Grid or any other component. The details Grid can be configured to use paging.
I hope the provided suggestions help.
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