when there is ftp transferring in backgroup, IME input lag obviously. Try any other FTP client like filezilla or flashfxp work fine.
including google IME pinyin and some other Chinese IMEs I test the situation can be reproduced.
http://www.google.com/intl/zh-CN/ime/pinyin/
the CPU usage is normal. Using Win XP sp3
ftp transferring make some IME input lag.
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