When you start a new server, start it, then /save-all then edit server.properties as desired then re-start with docker-compose up -d

To upgrade

docker-compose up -d

To profile

docker attach mc
/debug start
...wait...
/debug stop
CTRL-p CTRL-q

If "Something's taking too long" message are seen, there are too many farms. Kill them:

Find out where a player is

/data get entity PenguinLord Pos

Destroy all 'cows' near coordinate

/kill @e[type=cow,x=<X>,y=<Y>,z=<Z>,distance=0..1000]

See how many items there are

/data get entity @e[type=cow,x=<X>,y=<Y>,z=<Z>,distance=0..1000] type

To

docker attach mc CTRL-p CTRL-q to exit