Problems with Akregator / web engine

Hi.. I am having some problems with deleting articles in Akregator. If I had opened some specific type of articles, from then on, deleting articles takes a long time. For example, it takes 1-2 seconds for deleting 10 articles. 3-4 seconds for 40 articles etc. This started last year or so, but I was unaware as to what was triggering it. Now I can reproduce the problem. If I open any article from Slashdot feed or an article that has an embedded video (although it doesn't play in Akregator anyway), then all subsequent article deletions take a long time and at times cause a graphics reset. Even closing Akregator takes a long time and finally crashes. If I don't open any such offending articles in a session, then everything is OK. I'm running nVidia proprietary driver and I don't have any other problems in general. Only with Akregator and deleting articles. Any ideas on what could be the culprit? Syam