Marginal gains based on viewscreen size, I use a quarter viewscreen on a 2560x1440 display area, however all my performance marks come from packaging. My workstream is to always package after any change and test performance, hence why I had already managed to take UE5 to a massive open world with a great framerate. Across the board everything is slower now at runtime and despite massive optimisations that now effect quality, I am unable to get as good a framerate as in 5.3. Funnily enough I packaged my game back in 5.4 prior to preview, the frame rate way back then was the exact same, I therefore concluded at that time, the performance enhancements were yet to be committed to the main branch. Another example: In my open world render velocities has gone absolutely mad, now at 9-11m/s in my scene. I’ve never even seen render velocities in the profiler before that’s how small they used to be. I’ve been trawling the internet to try and work out what might be the cause of render velocities and as far as I can tell that is motion blur and temporal AA and Screen Space Reflections, however if I turn off anti-aliasing, reduce motion blur amount to 0, toggle motion blur off and then switch to no reflections I get exactly the same render velocities as I did running full lumen for lightning, Screen space for reflections, or indeed Lumen Lightning and Lumen reflections… Example 2: In my single landscape level where I have just a deathmatch level consisting of buildings, when I first loaded unreal 5.4 with the same config settings I’ve had in 5.3 + 5.2 I was at 20fps in the editor. After making optimisations to dynamic shadows and optimising reflections in project settings in editor I can now see 120 fps in the viewscreen there, however though my runtime performance is now more stable in that map, it is lower, despite the massive optimisations. Installing old tool chain today, I’m going back to 5.3 where I will be able to produce some real side by side tests hopefully later this afternoon!