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In my game there are a lot of objects which use the same shader however with different constant parameters set on each one. I've noticed that it adds a ton of loading time when it has to compile the same effect over and over for each object. Is there a way to either, duplicate a compiled effect, or set different constants on each object the effect is applied to?

The first thing to check is whether your shader is using tangents and binormals. If not then, if I recall correctly, you can speed up things enormously by using the donotgenerateextradata flag in the load effect command:



Otherwise the only way I know of, to set different constants in DBPro for different objects using the same copy of a shader, is to store the object specific data in a texture and read that in the shader. That works because you can apply different textures to each object. A trifle awkward but it works. Not sure offhand whether that helps the speed issue. Another solution would be to have an extra set of UV coordinates which contain the desired data - but that would be wasteful since the UV data would probably need to be the same for each vertex. Depends on what effect you are trying to achieve though.