Excel Form Issues - adding Signature Pad Field - Signature Rendering extremely slow

Hello everyone. I have a form that I'm attempting to create for general use at work. The workbook has 3 fields that require a digital signature from a Topaz Signature Pad. The problem appears when once the signature(s) start to render within each field; on average it takes at least a 60 seconds once you select "Done" from the Signature Add-In. Can anyone give me any advice on how to resolve this problem. I'm using a Macro Enabled format that will ultimately be saved as a Read Only to protect the integrity of the document. Do the signature fields have to be compressed somehow so they function in a timely manner or is my approach completely off??

Thanks for the response Skywriter.
What do recommend I do as a work around so that the Topaz Signature Pad Add-In renders with the attachment. I believe the code resides in their software that comes with the sig pad, so maybe there-in lies the problem. Maybe there's an update/patch needed for the pad?