MoveData is capable of supporting high throughput and has been used for numerous flagship campaigns and telethon events which require real time processing of significant volumes of data into Salesforce.
There are however a number of dependencies at play - occasionally at the API level of the connected platform, sometimes to tweak configuration within MoveData, and almost always from a systems and processes perspective within Salesforce. As such we recommend you conduct load testing prior to your event to simulate peak scenarios and identify and resolve any weaknesses.
Because of this variability, it is your responsibility to ensure the integration behaves in the manner you require when under high throughput. If you require assistance please engage MoveData to conduct load testing prior to your event.