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Is calling functions in different JavaScript files slowing down JavaScript processing by the browser?
In other words, can I call functions from a file to another one?
Or would it be better to call function in the same file?
It makes no difference at all. Regardless of which script file the code comes from, it gets intepreted into the document’s context, which is the same for all of the script files and inline script on the page.
You can test it with this incredibly sloppy script: http://jsbin.com/uxiye
Somewhat off-topic, but some of the other answerers are absolutely right to point out that while there’s no difference executing the functions, there can be a big difference in script load time… You didn’t ask about page load time, but still, worth pointing out.