post all your sending settings from respectiveNo, everything is as it is. With the latest upgrade mailwizz I started with this problem. Send a maximum of 15 mails per minute per campaign.
1 campaign = 15 shipments per minute
2 campaigns = 30 shipments per minute
From what you sent, it seems not to be limiting. You could try make the batches smaller, as maybe the dbf server is slow, and try without pcntl, and see how fast normal sending is (should still do more than 1/s). See if you use phpmailer in the common settings and how fast that goes (in my tests swiftmailer is 2.6x slower).add screenshots
I clarify that I have a server with MAWP and 30 IPS
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