Sending campaign flow would create tens of thousands records on DB. After each record insertion, there was a sleep(0.1) - in place to solve problems related to

Sending campaign flow would create tens of thousands records on DB. After each record insertion, there was a sleep(0.1) - in place to solve problems related to master/slave setup in other flows - just conditionally disabling the sleep was enough to reduce the procedure time from ~5min to ~30 secs