About Metastability Summary for QuartusII Compilation Report

I wish the Metastability Report were used more, but people seem to want to ignore it.

Note that if you go into Timing Analyzer and run Report Metastability(not just the summary), you can see all 206 chains analyzed to determine that number. It may be just a few synchronizers that are driving the final MTBF. Assuming you have Optimize for Metastability on(which is the default, and can be found under Assignments -> Settings -> Fitter), often the easiest way is to add another register to the chain(s).