Hi Lorryl,
Greetings from Syncfusion support.
Based on the provided information and shared sample we could see that you have rendered around 70 controls(textbox and datepicker) in the Grid’s edit template. We would like to let you know that for this case it will take some time to show the edit form since all the date picker and textbox controls needs to be initialized and rendered. This is its default rendering time taken for all the controls which is also the default html behavior when rendering huge number of controls dynamically in a edit form and so we cannot modify it.
Let us know if you have any concerns.
Regards,
Sujith R