Hi @oriol,
Thanks for reaching out.
I have checked the website on Android mobile phone, and the transition was smooth and there was no stuttering effect. Can you please check once by clearing all types of cache including the System Cache from Cornerstone > Settings > System > Clear System Cache and check in the incognito/private mode of the browser?
If that does not help, please provide login credentials for your site in a secure note to examine it further, including:
– WordPress Site URL & Login URL
– WordPress Admin username/password
To create a secure note, click the key icon underneath any of your posts.
Thanks