I have a laptop with internal GTX 1080 installed. It runs normal in editor. And today I bought an EGPU case and an RTX 2080 Super. When I run the editor with my external RTX 2080, in some scenes, some angles, the editor runs with low fps (slower than with GTX 1080) while NOT in game, but when I click play, even if it is PIE the frame rate comes back to normal. There is no code in level about tweaking the frame rates, such as r.ScreenPercentage.
For example from a specific angle (the slowest point of the level and the resolution is 2560x1440), while GTX 1080 gives around 50 frames, RTX 2080 gives 34 frames. Until I hit play. Is it normal for RTX 2080 to run significantly slower than GTX 1080 in editor? What can be the reason?