Another (not necessarily better) way of saving some resources, is by sending the debug output to a (hidden) window and simply having the debugger alias not /return anything; that way, that window will always remain empty, and no debug.log file will be created either. That's the method I use, anyway.
* I tried sending output to nul and nul: but mirc didnt like it
As far as I know, mIRC blocks such device names because of the old /con/con (etc) DoS problems..
