OPTIMIZATION
turn on fps and check everything in your scene when you are in your shot sequencer
skylight samples
post-process samples ray tracing and max roughness on reflections
technical:
DRAW CALLS
console command: stat scene rendering
check out mesh draw calls
render view family
hide the menu by doing the same command
From the main menu choose Window > Developer Tools > Merge Actors. Select a number of Static Meshes in your level that you would like to merge. Choose the appropriate options for merging the selected Actors. Click the Merge Actors button and give your new merged Actor a name, then click Save.
r.ForceLOD O force all the lods to 0