[2023] Lags after 2h Gameplay

I have 2 left here. one shows how fluid the game is when it's freshly started. The other shows what lags occur after 2 hours of play. Only after a complete restart of the game can it be played properly again.
The problems also occur when I start a fresh game and just let the game run with just one office
Anno 1800 is currently the only game that causes these problems on my PC.

Anno 1800 start gameplay without lags

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Anno 1800 lags after 2 hours gameplay
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System Information
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   Time of this report: 1/25/2023, 14:55:40
       Machine name: DESKTOP-6DAQ3F6
        Machine Id: {7D4CAD45-401D-4885-99DF-86E5EBF1B2CF}
     Operating System: Windows 10 Home 64-bit (10.0, Build 19045) (19041.vb_release.191206-1406)
         Language: German (Regional Setting: German)
   System Manufacturer: Gigabyte Technology Co., Ltd.
       System Model: Z690 AORUS ELITE DDR4
           BIOS: F7b (type: UEFI)
        Processor: 12th Gen Intel(R) Core(TM) i7-12700K (20 CPUs), ~3.6GHz
          Memory: 65536MB RAM
   Available OS Memory: 65310MB RAM
        Page File: 12728MB used, 62309MB available
       Windows Dir: C:\WINDOWS
     DirectX Version: DirectX 12
   DX Setup Parameters: Not found
     User DPI Setting: 96 DPI (100 percent)
    System DPI Setting: 96 DPI (100 percent)
     DWM DPI Scaling: Disabled
         Miracast: Available, with HDCP
Microsoft Graphics Hybrid: Not Supported
 DirectX Database Version: 1.0.8
      DxDiag Version: 10.00.19041.2075 64bit Unicode

I can't upload the complete Dxdiag here because I don't have the authorization otherwise I would have included it as an attachment