We've connections to the MySQL server from suspicious IP.
According https://www.abuseipdb.com/check/88.214.26.17, this IP has been reported today for "SQL brute force auth on honeypot MySQL/MariaDB". That could explain T1520 slowness if the MySQL process is too solicited.
Ysul has a MySQL server which listens to the world with the intent to serve as demonstration and support during workshops. We could switch to Drake IP instead.