Mautic Hangs or Takes forever to open a Large Segment

I’ve solved the Slow Segment “view” when clicking on a Segment in Mautic 4.5.x by adding an Index.

They suggested this Index:

CREATE INDEX lead_timeline_order_index ON lead_event_log (object, bundle, object_id, date_added ASC);

And works like a charm for my, now a segment with 30k contacts loads almost in an instant.

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