For example: If we add 25 sheets into the FlexSheet without the deferUpdate method, it needs more than 30 seconds to finish all the adding sheet operations. If we put all the adding sheet operations into the deferUpdate like following code snippet, it only needs about 0.8 seconds!
All Wijmo controls include the deferUpdate method. It's important to keep it in mind when doing any large operations or frequent updates to our controls. It's most commonly used in things like FlexGrid and FlexSheet, but is applicable almost anywhere with these conditions.