After years of trying to fix the sturring issues I've been having with Mirror's Edge Catalyst, I jumped back in once more to give it another go at fixing it and I believe I've finally found the cause.

Pay attention to the graph in the bottom left, which shows CPU and GPU spikes when the game stutters, typically during fast screen movement. I disable some settings, test, re-enable them to show the issue comes back, then finally disable them again.

The issue appears to be with some of the LOD billboard settings. I set the three settings below, though I'm not sure yet if it's one specifically or a combination of all three:

LMSBillboard.StreamingEnable false
LMSBillboard.DownscaleOnOverloadEnable false
LMSBillboard.LODBlendingEnable false

Also found this helped as well:

PostProcess.ScreenSpaceRaytrace32BitEnable false

Other commands at the begining are:
PerfOverlay.DrawGraph true (enables the performance graph)
PerfOverlay.DrawFps true (enables FPS counter in top right)
RenderDevice.VSyncEnable false (disables VSync)

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