CFC Size - When is it too large?

Size doesn't matter, except that the bigger your file, the slower it runs.

Look at how you are using your cfc's.  If you are attempting OOP, are you sticking to the principle of one job per class?

If you are using cfc's as a container for udf's, see if you can analyse the extent to which your calling pages use more than one of the functions.  You may find ways to break up the cfc's so that your pages process more quickly.

"When is it too large?"

Turn around.  Look way way way way back in the distance back when your CFCs got bigger than about 1000 lines.

That's when they got too large.

Not from an operational point of view, but from a "your object model probably needs looking at" POV.

From a technical standpoint, there's no real corelation to be made between "amount of CFML code" and "amount of Java byte code it will end up being".  Every method is compiled into a separate class, so it's really the size of your methods rather than the size of your CFCs that would be the barrier here.

But that aside, how is it that you have CFC files that large?  I start cringing when mine go over about 1500 lines, and start thinking "time to recompose this".

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Adam