I have kernel task problems. it is using >800% of cpu (YES, eight hundred percent). it slows my 15" macbookpro 8,2 (mid2011) in all functions down to unusability. system usage of cpu at activity control shows about 90% permanently even though there is nothing to do. the download of 35MB took almost 2 hours at a speed of 7KB/s. my battery is somehow involved, too. the mac is useless like it is now. I hope someone can help about it. if u post it here, I will check again later. thx.