My editor keeps on freezing for 4-5 sec

So, I started to make a project and suddenly the editor keeps on freezing on small changes either I add Cubes or move them or change there dimension . It freezes every time. it has become impossible to work with it . I have been using Unreal engine version 4.17.1

Later it was working perfectly, but i don’t know what happened now .
I know its not my system which is bottlenecking …
My Specs are–
CPU-Intel i7 6700k
GPU- GTX 1070
WINDOWS-10 {64-bit}

And i also read this type of threads before and everyone told to close the Epic launcher and run the editor alone but its not working with me…