Hi, Thanks for reaching out to community.databricks.com.

Could you please run a profiler trace on the SQL and determine what's the issue going on?

Also, please refer https://stackoverflow.com/questions/29638136/how-to-speed-up-bulk-insert-to-ms-sql-server-using-pyod... to add fast_executemany feature, which will be "off" by default, this helps to speed up bulk actions.