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Actual Performance comparision
I am working with a team which is realy eager to use Vaadin for a new project. I want to evaluate Vaadin performance agains PrimeFaces. I have found some information including https://vaadin.com/forum/#!/thread/3875659/3875658but these are too old. Is there any more recent comparision related to Vaadin performance and othere frameworks, specially about performance and cross-browser compatibility issuse such as different operating systems and monitor solutions?
Performance comparison is meaningless without context. Who/what is the target users of the application ?
As far as cross-browser compatibility, the main issues I have with browsers is not actually related to Vaadin or other frameworks for that matter. If enterprise is your target you face issues like Kerberos support (or lack thereof ) in Chrome, SSL Certificates that validate on some browsers and some devices and not on other ( they don't all have the same intermediary certificates loaded ), so you have to configure your ca bundles and certificates correctly.
No matter what framework you choose, show the default ( and/or addon) components to your target users. If they like what they see, use it. If they want you to make changes to components ( not just CSS facelifts ), consider evaluating other frameworks (or the ease of making those changes). The less customization you have to do, the higher the chance of success for the project.