[dthedavid]

What alternative approaches did you try?

Would loading a placeholder image for the map and transitioning it in when ready help?

[j0ej0ej0e]

Unless I recal incorrectly, LCP will finish when changes to that area are finished. So a placeholder is used, it will be pointless.

loading=lazy can actually negatively impact LCP

[walshemj]

That was my thought load a lowres fast image and lazy load the map