Forum Discussion
Slow performance with remote event receivers
We have a client that is using the InfoWise Solutions Ultimate Forms product with SharePoint Online. In the last week, the response time for saving list items that use Ultimate Forms has become much ...
If the RERs are synchronous (ie running against ItemAdding, ItemUpdating etc..) then I have seen delays on the UI when saving list items. In this scenario, the save needs to wait for the remove event receiver to finish doing its thing. A delay is typical behaviour for synchronous RERs.
When they are asynchronous (such as ItemAdded), saving a list item should be instantaneous, but the RER will still be processing afterwards.
You can check how the RERs are setup using SharePoint Online Client Browser.