Incorta is not an ETL tool. Incorta is unified data platform, which does not require a separate ETL tool. Handling the size of the data has many factors beyond just selecting a tool. It is also depending on the capacity of the servers and how the resources are allocated. The difference is that some tools know how to best use resources while others expecially old tools have so many baggage and cannot best leverage the resource. Incorta will not cause performance issue by not using an ETL tool, and it may address your performance issue if your performance issue is caused by having too many layers in your existing data warehouse and ETL based architecture.