It has been reported:
CIS still hammers msctf.dll up to over 1000 times per second.
This happens on all Norwgian installs of XP with the language toolbar enabled (which it is by default). I can provide log files or anything that's needed. This is an old bug so I don't have high hopes for it being fixed. It is a shame since it slows the computer to a crawl and surely leads to a lot of unistalls for those with the language bar enabled. I assume this bug hits other language editions also, but have not had a chance to test that.