Hi @mastergog,
thank you for reaching out to us. I can reproduce your problem and this would have not been something which we would have expected. If you go significantly over one million segments (1.1 million still works for me for example) no matter if in one node or scattered over multiple nodes, the viewport will freeze.
It is a bit hard to assess for us at the moment if this a bug or just a limitation of our viewport API. We will investigate the problem and I will report back here if there are going to be any short or mid-term fixes for that (or not if this is a limitation). For now there is unfortunately nothing you can do, since spreading out the segments over multiple nodes won't help you.
Sorry for the inconvenience and cheers,
Ferdinand