Microsoft IE and Google Reader just don`t mix..

I opened the Microsoft.com page today and did a search on blogs. The search gave me 1000+ blogs nicely categorized and an opml file that contained all those blogs...Hmm...1000+ blogs...let`s see how Google Reader handles it.
Opened Internet Explorer. Google Reader. Import...Imported the file with no errors and then...a sudden stop. Google Reader just got my processor up to 100% and stood there. Tried to tag some of the blogs...no response..Hmm...
Opened Firefox. Google Reader. Import...Imported the file with no errors and then..hmm..I can still do my work...I can still tag every entry...I can still read the latest posts..
Is it that Firefox is simply better or is it Google`s use of Ajax not well supported on IE?