No it is not your computer. The Yahoo development team has serious issues with performance problems. I have used them for years and it doesn't make any difference which machine you are on. One way of proving that is simply visit other sites. I have yet to lock up or freeze while typing text as you get with Yahoo mail. First the performance is bad .. now with nine it is impossible to use. So much for speeding things up.
Yahoo provides zero support to the community at large to aid in fixing this issue. It is really sad when the only advise given is turn off every feature and see if that works. Most of the replies I have seen are bandaids that ignore the real issue. Yahoo is buggy - now it might be that their ad stuff is causing all the real performance problems but we have no way to turn off that crap. There is a million little things running by yahoo everytime you open mail.
The replies I have seen are all general fixes.
1. Turn off add ons - well this might help but it does not fix the problem.
2. Turn off google menu - this is another bright light - blame your competition.
3. Look for event problems - big help here .. IE: crashes. .. end of story
4. Install again ... This one I love ... like the computer support guys who know nothing and always say turn on and off your computer.
It would be nice to have real support .. with the ability to trace the offending code and send that to Yahoo. This is so easy to provide but that would be admitting that Yahoo has a serious problem or worse it really is their ad stuff sucking all the resources.
As a senior IT consultant I am being unfair by coming to conclusions without facts but Yahoo does not help either. This is really not rocket science .. and we should be able to provide traces or put the code in debug mode or something.
So far I have seen lots of replies from everyone else but Yahoo. Shows you the level of interest on their side ..
Now before you think I am ignoring MS .. no I am not but Yahoo is a premier site .. do you really think MS and Yahoo don't exchange information, nor Yahoo does not have access to pre release versions of IE9 ... if not then they should realy spend the money on getting the support and actualy having a QA department.