Did some testing yesterday:
First, I can confirm that both layers work in parallel. I’ve installed the fov_modifier after the nis_scaler as you, @mbucchia suggested.
However, I encountered two interesting phenomenons:
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To test if the fov_modifier works, I’ve scaled down all settings down to 50% and received the “small view rectangle” as expected. Interestingly, this had absolutely no effect on FPS.
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Secondly, when scaling back to the suggested settings by @HyperJet2018, in contrast to my last test, I could now see a slighly decreased FOV (as one would expect), compared to the original 100% value. This however, was not the case some days ago, when I first tested the layer, which might be simply due to my subjecive perception.
As activating both layers together did not further improve FPS, I deactivated the fov_modifier again.