No idea, it is a thick client, to keep the server side thin, so the client does most of the work. I would guess its caching all the chat. You can set it to cache less lines in the settings on the bottom right - I think by default it keeps everything. Might save a bit of space. Remember this is a cheap and cheerful chat solution, if we want to live on there, we need something like IRC and dedicated IRC clients
true,more important that the server aint coming crashing down well done, good work I'd say but just wanted peps to know that it will probably make their pcs rock slow if they leave it running.