I am using Samsung Galaxy Y and I have tried installing Opera Mobile 12 on the same and I have found it stuttering. I have found that the screen just acts like it has been frozen and does not respond to the input and I have to reboot the phone to get it working. I am here also using other browsers as well but I am not having any such issues with it. It is only with Opera Mobile, I have tried out the below versions of opera and I am getting the same response from them.
- Opera Mobile 11.5.3
- Opera Mobile 11.5.4
- Opera Mobile 11.5.5
- Opera Mobile 12
I have used Opera Mobile 11.5.3 on other phones and I had not faced the same issue there, it seems that this issue is with android devices, I have checked about the same and have found many people complaining regarding the opera in their android devices.