Per Östlund

#12940 should finally fix this issue. We'll see what the regression tests says, but at least `sinSpeDX.dxCoi.coiCap.sta[1].nomVal.m_flow_nominal` gets the correct value now.

> It also fixed [Buildings.DHC.ETS.Combined.Validation.ChillerBorefield](http://libraries.openmodelica.org/branches/master/Buildings_11/files/Buildings_11_Buildings.DHC.ETS.Combined.Validation.ChillerBorefield.err) No, that's just one of the models that randomly fail, the SingleSpeed model was really the only one affected by my last fix.

> Too bad it only it only fixed one model... My first fix did fix a couple of models in [ModelicaTest](https://libraries.openmodelica.org/branches/history/master/2024-09-06%2013:46:44..2024-09-06%2022:33:00.html) at least.

> @perost, #12304 is now fixed, but the models > > [Buildings.Templates.Plants.HeatPumps.Components.Validation.HeatPumpGroupAirToWater](https://libraries.openmodelica.org/branches/master/Buildings_latest/files/Buildings_latest_Buildings.Templates.Plants.HeatPumps.Components.Validation.HeatPumpGroupAirToWater) [Buildings.Templates.ZoneEquipment.Validation.VAVBoxCoolingOnly](https://libraries.openmodelica.org/branches/master/Buildings_latest/files/Buildings_latest_Buildings.Templates.ZoneEquipment.Validation.VAVBoxCoolingOnly.err) [Buildings.Templates.ZoneEquipment.Validation.VAVBoxReheat](https://libraries.openmodelica.org/branches/master/Buildings_latest/files/Buildings_latest_Buildings.Templates.ZoneEquipment.Validation.VAVBoxReheat.err) [Buildings.Templates.Plants.HeatPumps.Components.Validation.ValvesIsolation](Buildings.Templates.Plants.HeatPumps.Components.Validation.ValvesIsolation) [Buildings.Templates.Plants.HeatPumps.Validation.AirToWater.err](https://libraries.openmodelica.org/branches/master/Buildings_latest/files/Buildings_latest_Buildings.Templates.Plants.HeatPumps.Validation.AirToWater.err) > > still fail during flattening. Not sure if this is related, can you...

#13024 fixes the "Could not evaluate structural parameter " issue. With this fix the model instead fails with no error message, which turned out to be due to issues with...

I ran the 204800 model through valgrind, but it's hard to draw any conclusions from that. The majority of the time is spent in `NFComponentRef.toString`, it looks like the NB...

For reference, the 409600 model took about 105s to compile for me. #12632 fixes a missing initial bucket count in `NBJacobian.SparsityColoring.PartialD2ColoringAlgC`, which shaves off about 1s. There might be other...

Both of my PRs are now merged, and I can't really see any other obvious ways to significantly improve performance. It might be possible to make small optimizations here and...

> @perost, as I understand you analyzed the performance of the NB part already and shaved off some time with obvious data structure handling fixes. I would ask you the...

> There is JSON.mo file that could be used and passed to OMEdit that it could possibly transform to QVariant or work with directly. I would avoid passing large strings...