Performance Problems in Act 3 cruel / Map Device Problems

Reach Endgame - massive performance problems in Act 3 (normal + cruel) so far (Xbox Series X)

Act 1 and Act 2 perform on Xbox Series X in my case very well. Act 3 is very low of performance.

Act 1 + 2
- litte Frame Drops - but run very well
- Overall playable in case of early access !

Act 3 + Act 3 (cruel)
- Loosing Textures - 1 sec Black Screen -> switch to full textures than switch back to white screen and so on - Resolution Drops down (Utzaal(?) Area is massive with this Problems)
- randomly massive FPS drops !
- HUB Town - low FPS / missing textures
- Using Map device -> Xbox crash randomly
- Using Map device -> soemtimes dont show the Endgame Map only low texture grey -> full screen

BTW: This Game is awesome in Game Design an is an new benchmark of ARPG Games! GG for GGG !!