Welcome to the forums IIRC the theoretical limit to computations is something like 1e32cps per kg per 1e-19 seconds. Or in other words if you could collapse 1e19 kgs per second into a black hole and use that for computation you'd generate around 1e50cps. That's a hell of a lot of orders of magnitude above current technology IRL.
In OA there are many computational technologies that allow for greater cps per unit volume/mass. MOTEs and ultimate chips are a common example of physical technology, archai can use mag matter to run plasma processors even better than that. And in the extreme we even have objects such as neutron stars and wormholes used as computers. So there's a long way to develop before bigger is the only option and in terms of bigness the highest archai utilise tens - hundreds of dyson swarms, Jupiter and moon brains just to think.
In answer to your other question there's no chat that we use but the forums can get pretty busy.
In OA there are many computational technologies that allow for greater cps per unit volume/mass. MOTEs and ultimate chips are a common example of physical technology, archai can use mag matter to run plasma processors even better than that. And in the extreme we even have objects such as neutron stars and wormholes used as computers. So there's a long way to develop before bigger is the only option and in terms of bigness the highest archai utilise tens - hundreds of dyson swarms, Jupiter and moon brains just to think.
In answer to your other question there's no chat that we use but the forums can get pretty busy.