The best to do is try it. It’s most likely going to function somewhat well for most things in the engine. A few things that are probably going to be slower are material editor updates to the preview render, large landscape foliage and material modifying, and potentially processing shaders at first opening of a project or after certain settings changes and restart of a project. But I discovered a way to drastically reduce that and could share a link to the video of it if interested. Lightmass calculations wouldn’t be too slow, most likely, even for larger scale projects. There’s also level streaming and perf optimization. If using GPU Lightmass, I don’t know how speeds are for that, and it’s not currently supported, apparently, in the latest version (4.25.3). It’s supposedly set to be supported in 4.26. Lots of issues were encountered in the latest 4.25 versions, especially lighting / shadowing noise.