I have mad an HDA for computing vertex color in 3dsMax. Though the hda depends on static infomation only, like normal and vtxnum, it recooks between each frame and make the whole 3dsmax running really slow. Is it possible to cook only on the first frame and keep the vertex color data all through the whole animation? Thanks for any replying.

This should now be fixed in the next Houdini 18 daily build (18.0.568). The plugin will now only recook an HDA during a time change if the HDA has any time dependent nodes.