After updating the wpOpus Pro plugin, all previously installed typography fonts are deleted. The system needs to reinstall the typography locally on your server. If you had a long list of typography installed, this process may take some time, and sometimes the page might show an error of Request Time Out.
If this happens, simply refresh the page, and the process will continue, allowing the page to load. Once all the fonts are installed, you will not have page loading issue any further.
Please note, this issue only affects the admin page; the front-end of your site will not experience any loading problems.