Optimizations?

[Charles Sanglimsuwan]

Hi everyone,

I'm getting a measly 51fps on a simple flash file in my XNA project.  I've commented out the part of the code that polls for input to get to 51fps.  My computer's specs aren't too bad either: Core Duo 1.66ghz, Radeon x1400, 1gb ram.  The flash swf I have is 1280x720, and all it does is display a raster image.

I used some profilers and they're reporting these lines of code to be the culprit of slowness (in GeometryBatch::Draw()):

			mVertexBuffer.SetData<VertexPositionChunk>(mVertices, 0, mVertexAddPoint);


			for (int b = 0; b < mBatchesData.Count - 1; ++b)
			{
				for (int i = b * CHUNKS_PER_BATCH; i < (b + 1) * CHUNKS_PER_BATCH; ++i)
				{
					mEffectParam_Xforms[i % CHUNKS_PER_BATCH].SetValue(mXforms[i]);

					mEffectParam_Colours[i % CHUNKS_PER_BATCH].SetValue(mColours[i]);
					mEffectParam_CxformMuls[i % CHUNKS_PER_BATCH].SetValue(mCxformMuls[i]);
					mEffectParam_CxformAdds[i % CHUNKS_PER_BATCH].SetValue(mCxformAdds[i]);

					mEffectParam_Textures[i % CHUNKS_PER_BATCH].SetValue(mTextures[i]);
					mEffectParam_TextureMatrices[i % CHUNKS_PER_BATCH].SetValue(mTextureMatrices[i]);
				}
				mBatchEffect.CommitChanges();

				mBatchEffect.Begin(SaveStateMode.SaveState);

				EffectPass pass = mBatchEffect.CurrentTechnique.Passes[0];
				pass.Begin();
				mDevice.VertexDeclaration = mVertexDecl;
				mDevice.Vertices[0].SetSource(mVertexBuffer, 0, VertexPositionChunk.SizeInBytes);

				mDevice.DrawPrimitives(PrimitiveType.TriangleList, mBatchesData[b], (mBatchesData[b + 1] - mBatchesData[b]) / 3);
				pass.End();
				mBatchEffect.End();
			}

Are there any optimizations that people can think of to improve this speed? 

I got rid of the % CHUNKS_PER_BATCH and replaced it with an iterative counter that resets everytime it reaches CHUNKS_PER_BATCH, but it doesn't seem to help very much.

Thanks,
Charles