scrolling html in konqueror by keyboard SLOW, trails...

Any clues as to how to fix this: * scrolling any html in konqueror by keyboard is painfully slow, producing "trails" of moving text ; applies to <PgUp>, <PgDn>, <Space> and arrow keys, not to <Home> or <End>; * scrolling via mouse and scroll-bars is as fast as usual. -- AD (Andi) Marshall Cell: +84 (0)903871313 eM: admarshall@gmail.com Zone: ICT (IndoChina Time, GMT/UTC+7) Post: HoChiMinh City (ex/or SaiGon), VietNam