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Regression: Viewport render recalculations when nothing changed in scene.
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System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.59

Blender Version
Broken: version: 2.90 (sub 2), branch: master, commit date: 2020-05-21 21:20, hash: rB8f21f867e715
Worked: 2.79

Short description of error
Viewport starts to rerender from scratch even after click, grouping nodes, adding reroutes etc.
Here is comparision and details.

Event Timeline

@TheRedWaxPolice (TheRedWaxPolice)
Yep, they didn`t fix it at 2.80+: there is also unnecessary calls when you add node) and it become worse now.
2.79 have only one case for unnecessary rerender. When reroute combines parallel routes.

Can confirm. 2.83 latest is also affected