Timing Issue Need Help

Hi Dears：

There is a project, I constrained the fmax to 500Mhz. It can run above 500mhz after I enable the physical Synthesis Optimization - register retiming. If this optimization not enabled, it just ran at about 330Mhz. I attached the project, could anyone check my source code and point out where is the issue?!

I assumed that there is some code style issue, but i can't sure.