Hi Pete Ramirez,
Greetings from Syncfusion.
We would like to let you know that we were able to reproduce the reported crash issue with after enabling all exception from Common Language Runtime Exception settings by continuously typing the text quickly. We have checked and analyzed the reported crash issue. In our SfComboBox, we used the Asynchronous method to search for data. To that end, we used the cancelation of the task as described below
A "TaskCanceledException was unhandled by user code" error will be raised here if "Just My Code" is enabled on your computer. On Express editions JMC is enabled and cannot be disabled. The exception is to begin. Just press F5 to continue executing your code.
We already logged an improvement task for getting better performance of search the data with asynchronous in SfComboBox, it can be tracked through our feedback portal below.
Please cast your vote to make it count. We will prioritize the features every release based on the demands and we do not have an immediate plan to implement this feature since we committed with already planned work. So, this feature will be available for any of our upcoming releases.
If you have any more specifications/suggestions to the feature request, you can add it as a comment in the portal.
Please let us know if you need any other details.