Best Performance?

We can't tell if the CWB writers are being humorous or not:

• Thirteen people were shot in Chicago over the weekend, four of them fatally, marking the best performance for the same weekend since 2017, according to HeyJackass, a website that tracks Chicago violence using official and open-source data.

So does "best performance" mean lowest number of shootings?

Or do they mean the kill percentages are getting better along with the aim of the ne'er-do-wells? Because a 30% success rate is almost unheard of these days.

It's a bit of unintentional dark humor - and we appreciate it.