For me at least, the average framerate doesn’t actually change all that much if it’s standalone or in-editor. The only difference is that in-editor it stays at a solid framerate (40 for example) where with standalone it gets between 35-45 depending on where it is in the animation, and averages out to about the same anyway. There are no changes between the project as it is by default and how it’s being tested, outside of the VXGI having diffuse/specular disabled for the relevant tests.
For convenience, I did the same as the standalone windowed, with the editor open but minimized. 1080p display, and if it makes any difference I’m on the 3GB 780, not the 6GB one. The window was running at 1280x720, as is the default.