CTS+ change deployment taking long time in Portal 7.3

Hi Experts,

Good Morning,

Please find details of current scenario :

We have configured CTS+ for portal landscape (EP 7.3) and Solman 7.1 is acting as communication system.

Issue : When we start import of transport in subsequent portals ( such as Quality), Deployment phase take long time for completion.

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Request you to provide inputs on this.

Thanks in advance.

Regards,

Hanumant