Event management with Indico

I've been interacting with indico for many years (it's the standard for all conferences in the high-energy physics community). It's...ok, at least from a user's perspective (from what I remember, creating events is needlessly complicated, but I haven't administered an indico site in many years and maybe that has improved).

At bigger conferences, it often seems overloaded, but I'm not sure if that's inherent to indico or a result of either meager conference venue internet or the fact that the indico page is often hosted at a far-away institution (e.g. CERN or LBNL) on what could very well be an underpowered server.