Platform: Windows 10
When I try to import a CSV file with the below structure and 5,000 lines, it takes nearly two minutes for the IDE to go from the Source File>Destination process (hanging the entire IDE in the process). Once you get to the Destination process, everything is nearly instant. Something seems very wrong with the "file check" stage. Note this happens with all CSV files.
Below is a shot of the structure from Excel; nothing weird about it. 5,000 lines.
