I can't comment so I post this as an 'answer' to the comments of above answer How to use wkhtmltopdf.exe in ASP.net
If --redirect-delay doesn't work, try --javascript-delay
See here for all the options: https://github.com/antialize/wkhtmltopdf/blob/master/README_WKHTMLTOPDF
Or do wkhtmltopdf -H for extended help (afaik same output as above link).
