Using it in documents has no impact in the size of the saved document. If you were to save a document with a bitmap image of your signature the document size will increase significantly. Bitmap images of signatures can be from 100 to 1000K in size depending on their quality and size. Documents using the Signature Font load much faster than similar documents with embedded or linked bitmap images. Documents also print much faster when using the Signature Font.
Logo fonts provide all of the same advantages of signature fonts.
However, due to the size of logos, logo fonts will save even greater disk space and result in significantly smaller file sizes. Your personal logo can then be sized to any size without any distortion. Open the Fonts folder existing in the Control Panels folder. The TTF font is installed. We don't provide fonts in Macintosh at this time.