Improve speed of sending push notifications

Hi, I am using Push Notifications Connector for sending pushnotifications to iOS (by APNS) and Android (by FCM) devices. Each day we send out around 17500 notifications which takes about 30 minutes,   So about 580 notification per minute. This is to slow because when people get the notification the subject that they have been alerted to has already lost relevance to them. Any ideas on how I can speed this up ? Ideally it should take max 5 minutes to send them all. We are on Mx 7.23.19 with version 3.0.1 of the connector. Would upgrading to version 4.0.7 improve performance ?        
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