slow replace operation

i have a 756KB text file with near 50.000 lines (utf-8, includes Turkish characters) in a CVS versioned project. Under IDEA (5.1.1), i wanted to replace some spesific characters with another one (turkish spesific chars). replace all operation freezes the idea for a very long time. it could finish the operation in minutes. is there a spesific reason why it takes such a long time? Some not so possible reasons come to my mind is the undo information, local versioning, creating CVS dif information.. any clue?

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