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To promote inter-study comparability it is desirable to standardize experimental procedures in text entry experiments. This includes standardizing the language. The current trend is to use English. To clarify the implications of use of English in non-English speaking countries we measured text entry performance with a QWERTY keyboard for 16 participants transcribing phrases in two languages. The languages were Finnish - the first language of the participants - and English, in which the participants had considerable skill. English language entry was about 16% slower than Finnish. The participants also made more errors when transcribing English.
Isokoski et al. (Sat,) studied this question.