[Shiandow]

Well, it does need a lot of texture calls, then again so does Jinc. What program did you use?

Edit: You can also try making the window smaller by changing the line:

	float4 lancz = {0.328511,-0.0365013,-0.0365013,0.0040557};
	lancz /= dot(lancz,4);
	float4 w = {1,1,1,0};

to

	float4 lancz = {0.328511,-0.0365013,0,0};
	lancz /= dot(lancz,4);
	float4 w = {1,1,0,0};

or even

	float4 lancz = {1,0,0,0};
	lancz /= dot(lancz,4);
	float4 w = {1,0,0,0};