Improve LCP by Deprioritizing Script Modules from the Interactivity API

Illustration of a bison fetching a script module with low priority in order to run faster. The bison is in a data center looking at a stack of blocks which have low priority on the side.

Adding a fetchpriority of low to script modules and moving them from the head to the footer can improve LCP by >9%! I’ve written plugins you can use to implement this now while waiting for them to land in WordPress core.