Ghostscript produces much larger pdf files now

Dear All,

I am using ghostscript to make pdf files smaller.

Three days ago I upgraded my system and now I am running 9.25 . However
the size of the pdf files increased significantly.

I guess a default value changed. Does anyone know about it. I'd like to
have it the way as it worked before.

I compiled the versions 9.24, 9.23 and 9.22:
It changed from 9.22 to 9.23 . Does anyone has an idea what changed here
such that the size of the output pdf files are bigger?

Thanks for your hints.

Flo

PS: I am using:
gs -dCompatibilityLevel=1.4 -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite
-sOutputFile="$outputfile" "$@"