Что например делать с этими варнингами:

Warning: Timing characteristics of device EP4CE10F17C8 are preliminary

Critical Warning: Synopsys Design Constraints File file not found: 'z80.sdc'. A Synopsys Design Constraints File is required by the TimeQuest Timing Analyzer to get proper timing constraints. Without it, the Compiler will not properly optimize the design.

Critical Warning: Timing requirements not met

И как к ним относиться?