Well there typically is a bonus in making a DLL in C over Delphi - file size. In the past I've made a mIRC DLL in Delphi, C++, and C and the filesize dropped by a third for each language respectively.
Of course vague is right about the app in this thread, there are a dozen different languages that could've made an IRC bot in about a tenth of the code that was much more adaptable, cross-compatible, and re-useable - all without any relevant hit to performance.
