FlexCelPdfExport.TagMode Property
If TagMode is full (the default), the generated file will be tagged. Tagged pdfs provide better accesibility support, but the files can be significantly bigger and take a little longer to create. If you prefer smaller files even if not accessible, turn this option off. Note that when creating PDF/A files with PdfType this property defines if the file is PDF/A-na or PDF/A-nb. This is because PDF/A-1a and PDF/A-2a require tagged files, so if this option is true the geneated files will be "a". If this option is false, then the generated files will be "b" which is a less strict standard and doesn't require tagging. To reduce file size, you might want to set PdfVersion to a value bigger than 1_4, since this will allow FlexCel to use better compression not available in PDF 1.4.
Syntax
Namespace: FlexCel.Render
public TTagMode TagMode { get; set; }