The problem with FroggieDaFrog's benchmark is that he's using .fseek -n bfw $file(wfwtest.txt).size, so instead of seeking to the end of the file it's actually ignoring the position parameter and just performing the -n switch search, ie. seeking to the next line, which requires mIRC to read a portion of the file to find where the next line starts.
Removing the -n switch reduces run-time of the /f* command set by 20-40% depending on which system I run the benchmark on.
Of course this is largely academic; if your intention is to write a single line to the end of a text file then /write is obviously a more suitable method since it's a quick and simple one-liner.
