The 10-fast-fingers test is seriously flawed, it adds each and every keystroke to the characters per minute var. If you type 100 characters and correct half of them, you will get a chars per min value of 200 (it counts backspaces as entered characters as well). You can verify this by typing the first word that appears, erase it, retype it and let the counter time out.
The words per minute is generally regarded as the number of correctly entered characters divided by 5 (including whitespaces), 10-fast-fingers just returns the number of correctly typed words. That is, pneumonoultramicroscopicsilicovolcanoconiosis will count as one word, when it really should count as 9.
If you don't like Typeracer for whatever reason,
http://speedtest.aoeu.nl is a much better alternative than 10ff.