It is possible to work around this by using a lower sample rate for SDI, and adding File Log blocks to save the complete data for post-processing.
For example, you can change the "Logging Sample Time" of the signal to 0.1 so that you will see a lower rate signal in SDI, allowing SDI to run more smoothly during simulation. To edit the "Logging Sample Time", right-click the logging badge (wi-fi symbol) for the signal, and select "Properties".
At the same time, you can log the signals via a File Log block which will preserve the original sample time of the signal. More information on File Log blocks can be found at: