Fix - Kirki downloading Google Fonts on every front-end request

functions.php

@@ -325,6 +325,7 @@ function flash_scripts() {
 
 // Kirki Toolkit.
 require get_template_directory() . '/inc/kirki/kirki.php';
+require get_template_directory() . '/inc/kirki-local-fonts.php';
 
 // Customizer additions.s
 require get_template_directory() . '/inc/customizer.php';

inc/kirki-local-fonts.php

@@ -0,0 +1,55 @@
+<?php
+
+defined( 'ABSPATH' ) || exit;
+
+function flash_kirki_local_fonts_ready( $fonts = array() ) {
+	$dir = WP_CONTENT_DIR . '/fonts';
+
+	if ( ! file_exists( $dir ) ) {
+		return wp_is_writable( WP_CONTENT_DIR );
+	}
+
+	if ( wp_is_writable( $dir ) ) {
+		return true;
+	}
+
+	if ( empty( $fonts ) ) {
+		return (bool) glob( $dir . '/*/*.*' );
+	}
+
+	foreach ( array_keys( $fonts ) as $family ) {
+		$folder = $dir . '/' . sanitize_key( strtolower( str_replace( ' ', '-', $family ) ) );
+		if ( ! glob( $folder . '/*.*' ) ) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
+function flash_kirki_skip_fonts_when_unwritable( $fonts ) {
+	if ( is_admin() || is_customize_preview() ) {
+		return $fonts;
+	}
+
+	return flash_kirki_local_fonts_ready( $fonts ) ? $fonts : array();
+}
+add_filter( 'kirki_enqueue_google_fonts', 'flash_kirki_skip_fonts_when_unwritable' );
+
+function flash_kirki_schedule_font_prewarm() {
+	if ( ! flash_kirki_local_fonts_ready() ) {
+		return;
+	}
+
+	if ( ! wp_next_scheduled( 'flash_kirki_prewarm_fonts' ) ) {
+		wp_schedule_single_event( time(), 'flash_kirki_prewarm_fonts' );
+	}
+
+	spawn_cron();
+}
+add_action( 'customize_save_after', 'flash_kirki_schedule_font_prewarm' );
+
+function flash_kirki_prewarm_fonts() {
+	wp_remote_get( home_url( '/' ), array( 'timeout' => 15, 'sslverify' => false ) );
+}
+add_action( 'flash_kirki_prewarm_fonts', 'flash_kirki_prewarm_fonts' );