Hi, from which PAR value antenna violations are too critical to ignore? In antenna report, there are violations with PAR values about 2000. Should I fix them or can I ignore them regardless of their value?

The antenna ratio rule limit is 400, so that's five times over the limit and probably a good idea to fix if you can.

Then what is the most efficient way to remove this violations? I tried diode insertion strategy 5 but did not make much effect, and diode insertion strategy 2 failed due to lvs mismatch, probably caused from fake diodes. So I don't really know how to get rid of them.

also interested to learn more about how to address this issue!

In <your run repository>/reports/finishing/antenna.rpt, you can search '*' character. It addresses the PAR value of the violating wire. Using grep command to list them all is a good idea too. But I don't exactly know which PAR value is critical.