i have similar 100% cpu bug. I loaded up 20 podcast web sites into banshee.
used them everything was working fine.
I then exited/rebooted and when banshee starts, slam cpu 100%, turns grey, totally useless and have to kill the process.
you can try it yourself, import these feeds then see what happens


PBS FRONTLINE/World
http://feeds.pbs.org/pbs/frontlineworld/

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PBS Nova WGBH
http://feeds.pbs.org/pbs/wgbh/nova-video/

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ABC News Extreme Video
http://feeds.abcnews.com/abcnews/extremevideo/

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ABC News Top Videos
http://feeds.abcnews.com/abcnews/topvideos/

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recent posts - blip.tv (beta)
http://blip.tv/rss/?s=feed

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CBC radio tv itunes
http://www.cbcradio3.com/podcast/video/iTunes/

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CBS Evening News
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http://feeds.cbsnews.com/podcast_eveningnews_video_1/?tag=contentMain%3bcontentBody/


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CNET Loaded
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http://feeds2.feedburner.com/cnet/loaded/?tag=contentMain%3bcontentBody/


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CNN Amanpour
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http://rss.cnn.com/services/podcasting/amanpour_video/rss/?format=xml


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CNN Daily News Room
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rss.cnn.com/services/podcasting/cnnnewsroom/rss.xml/


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CNN Daily News Cast
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http://rss.cnn.com/services/podcasting/newscast/rss.xml/


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CNN Student News
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http://rss.cnn.com/services/podcasting/studentnews/rss.xml/


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FOX News Flash
http://feeds.foxnews.com/podcasts/FoxNewsFlash/

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Cranky Geeks ZiffDavis
http://feeds2.feedburner.com/ziffdavis/cgh264video/

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Democracy Now!
http://www.democracynow.org/podcast-video.xml/

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Discovery Channel
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http://www.discovery.com/radio/xml/discovery_video.xml/


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Disney Shorty McShorts
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http://a.media.global.go.com/abccable/disneychannel/podcasts/shortymcshorts/rss-podcast.xml/


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LifeScape TV
http://feeds.feedburner.com/lifescapetv/

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NASA JPL
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http://www.jpl.nasa.gov/multimedia/rss/podfeed-hd.xml/


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Rocket Boom
http://www.rocketboom.com/rss/hd.xml/

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Revision3 Scam School
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http://revision3.com/scamschool/feed/quicktime-high-definition/


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Science Friday
http://www.sciencefriday.com/video/scifrivideo.xml/

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Discovery News
http://www.discovery.com/radio/xml/news_video.xml/

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VisionOn TV Global Views
http://feeds.visionontv.net/GlobalViews/

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VisionOn TV Plug and Play
http://feeds.visionontv.net/plugandplay/

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VisionOn TV Beyond TV Festival
−

http://feeds.visionontv.net/Beyondtvfestival/?format=xml/


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VisionOn TV GrassRoots
−

http://feeds.visionontv.net/undercurrents/grassroots/?format=xml/


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VisionOn TV Corporate Watch
−

http://feeds.visionontv.net/Corporatewatch/?format=xml/


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VisionOn TV Friendly Fire
−

http://feeds.visionontv.net/FrendlyFire/?format=xml/


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VisionOn TV Police Watch
−

http://feeds.visionontv.net/policewatchHD/?format=xml/


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VisionOn TV Climate Camp
−

http://feeds.visionontv.net/climatecamp/?format=xml/


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VisionOn TV Living in the Future
−

http://feeds.visionontv.net/Livinginthefuture/?format=xml/


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VisionOn TV Bik OZ
http://feeds.visionontv.net/Bike2Oz/?format=xml/

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VisionOn TV Balkan Babylon Rebels
http://feeds.visionontv.net/BalkanBabylonRebels/

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VisionOn TV Schmovies
http://feeds.visionontv.net/Schmovies/?format=xml/

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VisionOn TV Bush Craft
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http://feeds.visionontv.net/A-zOfBushcraft/?format=xml/


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Archive Classic Movies
http://www.archiveclassicmovies.com/acm.rss/

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Discovery Dirty Jobs Clips
http://www.discovery.com/radio/xml/dirty_jobs.xml/

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The Real News
http://videos.therealnews.com/