Ignore fonts, images, shading

When 'Ignore download fonts', 'Ignore images' or 'Ignore shading' has been checked in 'Options | Configuration General' tab, the appearance of the output cannot be expected to be an exact replica of the input, but

Ignore Download fonts may give better results when converting to PDFs (the symbol set needs to set correctly, see About symbol sets).
Ignore Images speeds file processing and, if images are overlaid on the text, may make it easier to read.
Ignore Shading results in smaller file sizes (if you can tolerate the absence of shading – shading does not compress well).