I'm not sure where you're getting 7 from, there are definitely no nodes defined in the realtime section, but I'm not familiar with how the realtime model does things either. Do you have a reference for that?
In addition to the nodes, the number of sections used has increased, originally it was 120 or so, more recent tyres are 200+. I'm pretty sure (based on the realtime bristles parameters) they're all used in realtime at least. But could be wrong
Anyway, there's definitely been an increase in CPU demand over time, but hardware has improved much more over that time. I'm just about to upgrade which should keep me safe for a few years yet.
Here are two pictures taken from ttool's realtime portion:
https://i.imgur.com/JG1GTly.png
https://i.imgur.com/SqPCBpY.png
https://www.studio-397.com/2016/10/tyres-the-big-one-part-iii-realtime-model-batch-tests/
https://i.imgur.com/mSOiWF1.png
THe way I see it is, all the data from the tyre generation are translated to those points seen in the first 2 two pictures. Has the number of sections increased in realtimemodel, I dont know. If someone has older build installed it can be easily checked
edit: QSA pics for comparison:
https://i.imgur.com/eYIxoHw.png
https://i.imgur.com/dOC2Yjx.png
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