In the most recent snapshots, when you use the tick, or arbitrary_player_tick triggers, it will spam the console with "Loaded 'X' Advancements". This can cause quite a bit of lag, and it is next to impossible to find an error within this slew of messages.
- Take the tick folder, down below, and drop it into the advancements folder of your world.
- Open the world with the console open.
- Observe lag, and lots of spam.