Hello Michael MSTG,
Unfortunately, the LoadSize feature is the only feature that RadDomainDataSource lacks compared to the stock DomainDataSource.
We have some distant plans for a more complex caching mechanism, but I cannot commit to a specific time frame for its implementation, since it will be shared between different controls (at least that's the idea) and we have not yet fully designed it.
Please, excuse us for the inconvenience.
the Telerik team
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