A prospect was using the PrizmDoc Server SDK to create thumbnails in his project per the code example here:
https://help.accusoft.com/PrizmDoc/sdks/server/dotnet/v1/how-to/thumbnail-first-page.html
Executing this code actually takes quite a few seconds for even a single-page MSWord file with a couple of lines of text. The biggest delay appears to be particularly on the call to ConvertToPdfAsync().
Having a faster process for creating thumbnails iwth the SDK will allow for faster overall batch processing.