I remember the days when Shredder was practically unbeatable in computer chess tournaments and ratings but now it's not even on the top 15 in terms of strength

I remember the days when Shredder was practically unbeatable in computer chess tournaments and ratings but now it's not even on the top 15 in terms of strength (Check CCRL: http://www.computerchess.org.uk/ccrl/4040/ http://www.computerchess.org.uk/ccrl/4040/). Oh how the mighty have fallen! The strength of chess engines have improved immensely in the last 5 years and none of that has anything to do with processor speed.