Wp mail smtp slow delivery of test mail and forms

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Hello there,
We are using your plugin WP MAIL SMTP since 6-7 months.
We found it really helpful.
But since last one month we are facing mail delivery issues like “slow mail delivery of test mail” as well as the forms we are using on our site biznessshelter.com are also get submitted very slowly.
After deactivating your plugin all works fine.
We are using Other Smtp.
Hope i will get the proper solution to fix these issues.