compression routine PDF or PDF/A still increases size of file

Aspose.Pdf for .NET 9.6.0

Our developer has been working with the compression information you provided but the results are minimally better. This is what we are doing:

publicvoid Save()

        {

            //save output document

            _pdfDocument.OptimizeResources(Document.OptimizationOptions.All());

            _pdfDocument.Save();

        }

What amount of compression should we be seeing and can we improve on this?   Developer says we are still seeing as much as a 250% increase if PDF file size.

Thanks,
Kristen Theologus
Esquire Innovations