No, our Marketplace Multi-Vendor Module for Magento 2 does not affect any kind of performance issues with the standard Magento 2.
All of our extensions are built on standard Magento 2 MVC(Model View Controller) ORM (Object Relational Mapping) design pattern.
We also follow the best practice of extension development so that our extensions are as scalable as your standard Magento 2.
Please do contact us for any further queries or requirements. You can also check our Magento 2 Extensions for additional features.