Structure blocks. But bigger (and optimised). Up to 512 blocks!
Note: I am currently updating old versions to include the new optimisations and limit removals.
Huge structure blocks increases the maximum structure block size and corner search radius to 512 blocks. Render of the bounding box is also increased to 256 blocks.
In short:
HSB's corner search resolves instantly versus Vanilla which takes seconds (sometimes even crashes). This is particularly useful on build servers where players have access to create structures.
Example

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