Cant develope my project on UE5 (Performance issues)

Hi, i converted my project 4.27 to ue5 final and worked on a part of my big map. While that i witnessed big performance issues but kept doing my stuff. Now i tried to work on another part of the map and its literally impossible to change smth. Every time i click in editor to use erosion tool, ue5 loads 20 seconds (or doesnt stop loading as long as i click) and does not much. Compared to in ue4.27 i did all scalability from high to low to rise performance but not doing much. While just “flying” over the part of the map its on 50fps. I Rly need help. How to boost performance?

ryzen 3600
2070 super
32gb 3600mhz