Use actors to construction decreases performance?

I am using blueprints to construct scenary, this makes FPS drops? Otherwise, what kind of problem my I have?

I remove all tick actors, change all texture to low textures (512x512), set lights low, lighmass low and this problem continues.

I am using a AMD Rx 460 videocard
AMD FX 8320
8 GB Ram

Hold someone help me, I spend my day off trying to figure out this.

Sorry the bad english.

Try look up diffrent stat commands

Stat slow will show you time on every bit of frame prepering process, you can also use profiler: