Japanese Kotoeri input problems

[dziewuliz]

Just got my fancy MBP (15", 2.5 ghz) switched from a MacBook, and was really excited about the performance boost, when tried the Japanese input system Kotoeri.. Once I select it from the input context menu, it slows down the Mac, the input is barely responding (one kana character per second) and with all the updates and other stuff already installed, just don't want to completely reformat the disk... Any ideas? I was googling around, searching forums, and nobody seems to have experienced anything like this..
Btw, I ran the Japanese install of Leopard and later changed system language to English, would that be a poor excuse for such a bad performance?

Thanks for taking your time on this, really appreciate it!

 

[Nermal]

I just tried Kotoeri on my system and it works fine. That doesn't really help you, but at least it shows that it's not a problem with the input method itself.

 

[dziewuliz]

No not really, except it shows it's not the 10.5.6 update's fault.. Thanks anyways, I've just got through the Permissions/Disk repair and as it remains the same, I'll have to consider the clean install... Btw, does the Archive and install option actually store the whole user data? Like iTunes, Mail, iCal info?