How can the speed and performance of a PHP application be affected when implementing multilingual features, especially on devices like Raspberry Pi and mobile phones?

Implementing multilingual features in a PHP application can potentially slow down the speed and performance, especially on devices like Raspberry Pi and mobile phones, due to the additional processing required for language detection, translation, and rendering. To mitigate this impact, developers can optimize their code by caching translated content, minimizing database queries, and using efficient algorithms for language switching.

// Example of caching translated content to improve performance
function translate($text, $lang) {
    $cacheKey = $lang . '_' . md5($text);
    $translatedText = apc_fetch($cacheKey);
    
    if (!$translatedText) {
        // Perform translation logic here
        // Store translated text in cache
        apc_store($cacheKey, $translatedText);
    }
    
    return $translatedText;
}