multiple one insert/update for 10k of records is seriously slow, while it is much much faster if you aggregate it as one or a batch of hundreds or thousands, but infile is
I didn't realized that the overhead was this big until I've started to write a data scrapper for a dictionary site. hell, one insert is hell slow........ batch insert is much faster, and I don't think that I'll have to explain the last one, no?
Anyway, not to say that its bad though, if you're h aving a heavy traffic then may as well as enable it. Just be more aware of the security part and you'll be fine