Hi Havyn,
It sounds like you’re seeing that scrolling the canvas in Axure RP 9 is slow. There are a few different performance issues that we’re working on in the beta that should improve this in a future release, per the thread below:
Among the known issues that are filed are slowness when using dark mode, slowness when setting color filters on images, and slowness when working with or slicing large images. You can keep an eye on the bug thread above for updates on the upcoming fixes, as well as the 9 beta release notes thread for news on the latest builds.
Thank you!