Aritic Mail SMTP email sending speed is dependent on Aritic Mail SMTP reputation which falls under low, medium, high and great email sending reputation.

According to Aritic Mail SMTP reputation, email sending speed can vary from 1 email per second to 30 emails per second.

If you have purchased 120 emails per second EasySendy Drip (or EasySendy Pro) plan then you would be able to achieve a maximum of 30 emails per second email sending speed through Aritic Mail SMTP, given you have great email sending reputation from Aritic Mail SMTP.