https://www.seenlyst.com/blog/geo-blocking-ufw-iptables/
https://blog.reverside.ch/UFW-GeoIP-and-how-to-get-there/

IPtables https://ithelp.ithome.com.tw/articles/10312284

CPU speed:
    events per second:   924.48

General statistics:
    total time:                          10.0006s
    total number of events:              9247

Latency (ms):
         min:                                    0.97
         avg:                                    1.08
         max:                                    1.70
         95th percentile:                        1.34
         sum:                                 9990.05

Threads fairness:
    events (avg/stddev):           9247.0000/0.00
    execution time (avg/stddev):   9.9901/0.00

CPU + Disk IO

Memory

find /home/jwcorner/mail/jwcorner.com/noreply/ -type d \( -name cur -o -name new \) -exec find {} -mtime +1 -type f -delete \;