Problem with Google Page Speed because of custom font

It’s a common issue. Since Google PageSpeed flags layout shifts caused by fonts, using font-display: swap is a good move. Because you’ve installed the font via the WP backend Typography / Styles, you’ll need to override or add CSS to the font face rule so it includes font-display: swap. For example:

@font-face {
  font-family: 'YourCustomFont';
  src: url('path/to/font.woff2') format('woff2');
  font-display: swap;
}

If you can’t directly edit the @font-face definitions (for example if WP handles them automatically), try using a filter hook like enqueue_block_assets or wp_enqueue_scripts to add extra CSS that inserts this rule.

Also, check if any plugin or theme setting offers a built-in way to enable font-display, since that may simplify this instead of manually adding code.