World pregen
Pre-generating a minecraft world can help reduce the lag you may encounter when starting a new server as world generation is one of the most common sources of lag in minecraft.
If you would like to pre-generate your world start your server up then head to to the World & Backups page, we recommend you only pre-generate your world when there are little or no players online as it can cause severe lag.
Once there, you should see a little blue button with a sapling icon.
Clicking this button will open up a popup which will allow you to select how many blocks in each direction you want to pre-generate using the slider, changing this will also update the estimate of how long it will take to finish pre-generating the chunks.