When I start building lightings, it took 75-100% usage of my processor. Even my processor in very powerful (intel i7 9700k with gtx 1660 super graphics card)?

Development Rendering
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I made my new gaming pc previous year only for unreal engine 4.With specs of (i9 9900k, GTX1660 super graphics card ,with 3200 mhz 16 gb ddr4 ram). I takes lot of time to build up lightings now and sometimes shows error on my project and some times it shows highlighted graph of texture streaming pool****. I want to know that how can I optimize my game properly and how can stop these, texture streaming errors and building lighting smoothly without any errors****

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Hi!

Building lights does take a lot of time!! …if you’re using the default lightmass calculation then it “doesn’t matter” what graphic card you have, since the calculation is going to happen on/through the CPU!!
Unreal calculates lights on meshes as YOU set it up! If you have problems with your meshes or the way you build your scene: there will be lighting calculation errors…
If you have streaming pool error problems: you can raise the designated memory by commands! (something like ‘r.Streaming.PoolSize 2000’