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Throttle WordPress Heartbeat API Frequency to 60 Seconds

⚡ Target: functions.php 🔒 Tested: WP 6.6+ / PHP 8.2+ 💻 Lang: PHP
PHP (functions.php) 
add_filter( 'heartbeat_settings', function( $settings ) {
    $settings['interval'] = 60; // Set interval in seconds (default is 15)
    return $settings;
} );

Reduces high CPU usage from admin-ajax.php by slowing down the background Heartbeat API frequency from 15s to 60s in the post editor.

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