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 ~12.52ms to ~21.03ms.
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 a little tho).