What are the sizes of the following files which I think are in scenery directory?

 

OceanHeight20FieldHigh.dds

OceanHeight20FieldLayer.dds

OceanHeight20FieldLayer1.dds

OceanHeight20FieldLayer2.dds

OceanHeight20FieldLayer3.dds

OceanHeight20FieldLayer4.dds

OceanHeight20FieldLayer5.dds

OceanHeight20FieldHigh.dds: 292kb
OceanHeight20FieldLayer.dds: 5.33 MB
OceanHeight20FieldLayer1.dds: 5.33 MB
OceanHeight20FieldLayer2.dds: 5.33 MB
OceanHeight20FieldLayer3.dds: 170 kb
OceanHeight20FieldLayer4.dds: 170 kb
OceanHeight20FieldLayer5.dds: 5.33 MB

 

Hmm...guessing that's not a good sign these are DXT1 (except maybe High, 3, and 4). I will make backups and try converting them in DXTBMP to DXT1 and report back.

Ok, so looks like converting them all to DXT1 did not give me a performance improvement.

 

Not exactly a solution, but if I keep water at Low.2x performance is fine. There are white flashes, of course, but that may be ultimately a small price to pay.