Hi Marcus Johansson,
Thank you for contacting Syncfusion support.
Based on provided information we have checked the reported issue “The fade in effect for items in an SfDataGrid when ScrollMode is set to Async”. this is the expected behavior of our SfDataGrid. Currently, we are checking the feasibility to achieve your requirement. We will validate and update you the details on or before October 08, 2020.
We appreciate your patience until then.
Regards,
Vijayarasan S