Messages refreshing too fast

Hello there friends,
Since about a month or so, it has become very uncomfortable to read longer messages, such as newsletters. I have not made any changes to my settings.
Messages, whether in the client window itself or opened in a separate window, now take less than a minute to refresh and to go back to the top, making it necessary to constantly scroll back to the point where one had left off reading. This is annoying.
It is not happening in other clients or in the on-line window of my provider.

Is there a hidden setting somewhere that appeared with Version 9?

Best regards,