I work with G2/8 figures in Poser. But Poser 11.3 chrashes a soon I delete a figure from the scene. Also I have an issue with the windows 10 Update (KB4601319). It slows down the Poser (both versions 11.2 and 11.3).

Has someone else made experiences with this issues,

There have been a number of users complaining about this issue in other posts. It appears to be associated with a recent Windows 10 Update that apparently can't be rolled back.

I just checked my P11 install with an imported Genesis 2 figure and the app does respond slowly despite the subdivision set to zero. Saving the figure back into the Poser Library and using it after rebooting Poser seems to improve the response but the deleting still causes a crash.

Now I'm using Poser 11.2 instaed of 11.3 again. Version 11.2 runs stable with G2 figures. Poser Support told me Poser 11 has been discontinued since the release of Poser 12, so there will be no updates.

The other issue with the slowing down posers material room (shader editor) is caused by the windows 10 Update (KB4601319). I unisnatlled this specific Win10 update and stopped the windows update for some weeks. But this is no longterm solution.