The speed of light is a significant limitation at these kinds of scales.
It's not just a massive pile of wiring and magnets etc, it's a massive pile of wiring and magnets which kicks particles around a race track the size of a small town, with absolutely insane timing precision before dumping them into targets the size of buildings, all generating unimaginably huge volumes of data which have to recorded in nanoseconds.
It's not just a massive pile of wiring and magnets etc, it's a massive pile of wiring and magnets which kicks particles around a race track the size of a small town, with absolutely insane timing precision before dumping them into targets the size of buildings, all generating unimaginably huge volumes of data which have to recorded in nanoseconds.