Lot’s of total BS in this thread considering OP provided little to no info on his scene or system specs.
UE4’s renderer isn’t ‘unoptimized’ - there’s a reason it tends to look better than other engines, it’s flexible and packed with features. Unless you’re an experienced rendering engineer then ill-informed statements like that are totally invalid. There are bigger differences between Cry, Unity and UE that extend way past the renderer. Why do certain things run better in each engine? We can only imagine why frankly.
Every engine is “WIP” if you count ‘improvements’ as ‘work in progress’ - and it’s been around over 20 years.
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To diagnose your problem OP, you need to post more information. System Specs, screenshots of your scene and the details about the assets that are causing the slowdown.
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Finally, if you folks check the thread about dynamic lighting in UE (DFGI) - you will notice the whole reason they stopped working on DGI was to squeeze the last 15-10% of performance out of the renderer.
ProTip: If you want a stable job in the games industry, become a (good) rendering engineer. They’re a scarce resource.