It is something with the opera stable line, since build 25.0.1614.50 i experience lags in loading pages...
It has nothing to do whit the system because the issue dose not occur on Opera beta, Opera developer, older Opera versions than 25.0.1614.50 and neither on other browsers like Firefox. ...
And perhaps that "something" has to do with unique interactions between the software, the OS version used, the computer hardware, as well as the 'problem' software version numbers themselves. This is especially true when not all the software's users are experiencing or reporting similar problems! When explaining a user problem with any software, it is essential that a poster include details about his software version(s), the OS used, and some basics about his hardware (RAM, type/speed of processor). From those details, those who try to help can make educated suggestions... otherwise, they're just guessing in the dark.