Binding 150 records to a DropDown list should not be a problem from a performance stand point. I have played a bit and tested DropDown list (a native one and Kendo UI DropDownList using remote data) on Android na iOS devices and there was no observable delay in showing the records. What test devices did you use? Could you please share a runnable example that we can test?
As from an UX standpoint I am not sure that loading 150 records in a DropDown is the optimal approach, maybe you could consider a different approach for showing the data, that will be more user friendly.
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