I am using DX9/DX10 via SlimDX for a project, and am looking into ways of speeding up loading.
One of the slow-downs is loading the effect files. I am currently using Effect.FromString to load the effects.
I have looked through the documentation and on google, but I have found no way of precompiling effects for either DX9 or DX10.
The only slightly related articles are those of compiling individual shaders(pixel shader, vertex shader, etc), but it doesn't seem possible to recreate the effect after you compile the individual parts.