Hello Steve,
We fixed the issue related to the window resizing -- see the attached JavaScript.
Regarding the splitter visibility while it loads, you will have to change it in your code -- either by using
visibility:hidden or by setting initial styles to each pane so that it looks acceptable until the component is activated. Also, reducing the amount of content in the panes will trigger a better load time -- this can be done by using AJAX requests for the data.
Best wishes,
Alex Gyoshev
the Telerik team
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