Prism Mac shows this message: "Prism may affect the performance of your Mac. The developer of this app needs to update it to improve its compatibility."

When you launch Prism Mac version 6 or earlier with macOS High Sierra 10.13.4 or later, MacOS will show the message, "Prism may affect the performance of your Mac.
The developer of this app needs to update it to improve its compatibility."  You'll only see this message once. 

MacOS shows this message because Prism 6 and earlier were 32-bit applications. Starting with Prism 7, Prism is a 64-bit application. You won't see this message with Prism 7.