Thanks for reaching out and posting on our forums! I appreciate the description of the behavior you are seeing, and unfortunately, this is behavior we would expect when gaming while using our docking station. We do call out on the Amazon product listing and Plugable.com product page that we do not recommend our docking stations for gaming - only office/productivity application uses are recommended - due to the issues such as the lower FPS you are currently experiencing. We do our best to call this out on our product pages, but we are always looking for better ways to convey these technical details.
I am sorry to say that there is nothing that I can suggest in order to increase FPS while using our dock when gaming. If you’d like, I’d be happy to explore return options if the issue you’re encountering means the docking station would not be a good fit for you. To get started please send us an email to firstname.lastname@example.org with your Order ID and I can get this started, we wouldn’t want you left with a docking station that did not meet your needs!