Simple SQL query that runs 7 seconds in SQL takes 19 minutes(!) to validate in Dataflows 19 minutes!!!??? Not just one query. I've tried SQL Server and PostgreSQL - the time it takes to Validate i...
It's pure performance issue on MS side. Very frustrating: sometimes more than 2 hours for a few changes!
It is my opinion also that after hours or in the weekends you have sometimes more luck.
But this unprofessional slow.