When coalescing-as-needed, immediately drop complete geometries that are identical, since the duplicates will be collapsed later on in cleaning anyway
When simplifying and cleaning geometries early to reduce the total memory footprint for geometry, concatenate multiple geometries together instead of preserving the individual identity of coalesced features
When converting between feature representations within each tile (from partial to coalesce to mvt_feature), clear out the old representations while building the new instead of waiting to clear the old until they have all been converted
partialtocoalescetomvt_feature), clear out the old representations while building the new instead of waiting to clear the old until they have all been converted