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Sending Newsletters with Coupons is very slow

Check the configured coupon code length and increase to 8 or more.
 
A short coupon code length makes it more difficult for the system to find a free coupon code.
 
Also make sure to clean up your coupons with the feature "Delete Expired Coupons" in MailBeez > Configuration > Coupon Engine to keep your coupon database as slim as possible.