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2d_po layer significantly slowing simulations

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I’ve recently been running a linked ISIS‑TUFLOW model (ISIS 3.7 / TUFLOW 2013‑12‑AD – both 64‑bit DP) and I’m noticing a large change in simulation time if I include PO lines along the 1D/2D boundary. No PO lines – the simulation takes approx. 4hrs. Including the PO lines (approximately 100 in total) – 11hrs. No other changes to the model setup.

I understood from the latest release notes that 2d_po flow lines should not slow down a simulation (see point 23 on p11 - TUFLOW Release Notes.2013-12.pdf). Is this still a known issue or a bug?

Cheers for any help.


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