How to increase performance (Transfer rate) of DMA core?

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Which DMA are You using? SGDMA has way much better results than simple DMA.

Nios systems running above 100MHz needs to be timing constrained very well.

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I am using DMA. SGDMA is hard to understand, i am still struggling with it, do you have a simple example involving SGDMA? like transferring ST to memory or memory to memory?

What if i do not do any timing constraint on NIOS2? what will happen?

I thought the .sdc file is generated by SOPC builder automatically after HDL is generated? so all i have to do is just include the cpu.sdc into the timequest timing analysis?

Michael