Does setting the buffer usage flag to BUF_Dynamic automatically affects the dynamic light caching for this mesh? For my test mesh, it seems that just by changing this flag, the ShadowDepths statistic goes from ~2.1ms to ~4.2ms.
On the other hand, setting the proxy’s bGoodCandidateForCachedShadowmap to false or the Mobility to Movable (as per IsMeshShapeOftenMoving()) doesn’t seem to raise the same statistic (it does degrade the overall performance by ~0.5ms tho).