You can change settings to get ue 4 like performance
The fps are capped by default
Use this console command to get real fps
T.Maxfps 999
In project settings
Global illumination to None
Reflections to screen space
Anti aliasing to TAA
Shadows to shadow maps
And in defaultengine.ini File
Add this line in enginerendersettings
r.Nanite = false
(Nanite still work in background even when there’s no mesh that works with nanite which cost too much performance)