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DCS 2.9.1.48335 Open Beta Setup:

DCS OpenBeta (MT Version) on NVmE, i7 9700k @ 4.2GHz, 32Gb RAM, RTX 3080Ti

Issue overview: All Mirage F1 models currently do not have optimised LOD models, resulting in immense resource use even when viewed at distance as the full model is rendered. This results in 12 Mirage F1s able to reduce framerate by up to 70-80% on high end systems. This is due to no LOD1/2/3 models being created for the Mirage F1 at this time. This in particular results in significant system slow downs in airports where Mirage F1's are located (in example cold war servers such as Engima's cold war) resulting in significant performance loss, particular for VR users.

See video for demonstration:

Note that this test uses an exaggerated LODmult value (0.02, set manually in options.lua) equating to a 50 fold change in distance for LOD switching compared to default value of 1.0. Note that the Mirage F1 only utilises one Level of LOD, with a switch quite a considerable distance by default with no intermediaries compared to other planes with more optimised LOD intermediary models. Additionally, the model is not rendered much earlier than most other in game models.

I note that @Flappie has stated this is already known to Aerges, however I was unable to locate an official thread on the forums here hence the post.

 

Performance loss demonstrated by unoptimised LOD models for Mirage F1:

1.jpg

2.jpg

3.jpg

Note the constant performance decrease until at very far distance, where LOD models finally switch resulting in >200% increase in performance with no discernible differene in model quality due to immense distance. This second test was conducted with a LODMult value of 0.5 (more in line with typical use case).

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