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Consejos para mejorar el rendimiento de nuestro sitio web a través de la caché del navegador

Escrito por Ing. Maikel Maldonado del Toro, 23 de Marzo, del 2017
 rendimiento caché navegador Apache

Un problema cotidiano a presentarse en portales y sitios web con gran volumen de información, es el rendimiento, al cargar para mostrar los contenidos al usuario final. Cada vez que un navegador carga una página tiene que descargar todos los archivos de Internet para su correcta visualización: esto incluye el HTML, CSS, JavaScript, imágenes, etc.

La consecuencia de esta descarga de archivos provoca que:

- Los archivos grandes tardan más en cargarse (extremadamente lento con conexiones lentas).

- Cada archivo realiza una petición separada al servidor. Mientras más peticiones se hagan al servidor más trabajo tiene que hacer este, lo que reduce aún más la velocidad de carga de la página.

Analizando los elementos anteriores podemos determinar que la caché del navegador ofrece una solución mediante el almacenamiento local de algunos de estos archivos en el navegador del usuario.

Se debe tener en cuenta que la primera visita al sitio tendrá el mismo tiempo de carga, sin embargo, al usuario regresar a visitarlo, actualiza la página o incluso se mueve a otra página en el mismo, con lo que ya este usuario tendría algunos de los archivos que necesita a nivel local en su navegador.

Entonces, podemos resumir, que cuando un sitio ya se cargó en la caché del navegador del usuario se minimiza la cantidad de datos a descargar, y además se producirán un menor número de peticiones al servidor, con lo que los tiempos de carga disminuyen.

Nuestro consejo para usuarios es ¨Habilitar la caché del navegador¨ utilizando el módulo de “expires” de Apache (mod_expires).

El módulo expires es una herramienta del servidor Apache cuya función es informar al navegador del usuario cuánto tiempo se recomienda que un objeto se guarde en su cache; para habilitarla se necesita modificar las cabeceras HTTP de las peticiones para establecer las fechas de expiración para ciertos tipos de archivos (solo funciona si el módulo expires está activado).

Para activar este módulo de Apache debemos ejecutar en consola los comandos:

sudo a2enmod expires
sudo /etc/init.d/apache2 restart

Posteriormente se procede a configurar mod_expires en el archivo .htaccess de nuestro sitio y colocar lo siguiente:



<IfModule mod_expires.c>

ExpiresActive On

ExpiresByType image/jpg "access plus 1 year"

ExpiresByType image/jpeg "access plus 1 year"

ExpiresByType image/gif "access plus 1 year"

ExpiresByType image/png "access plus 1 year"

ExpiresByType text/css "access plus 1 month"

ExpiresByType application/pdf "access plus 1 month"

ExpiresByType text/x-javascript "access plus 1 month"

ExpiresByType application/x-shockwave-flash "access plus 1 month"

ExpiresByType image/x-icon "access plus 1 year"

ExpiresDefault "access plus 2 days"



Para comprender mejor lo que hemos hecho, vamos a la primera línea:

ExpiresActive on

indica que el módulo expires debe estar activado. Ahora vamos a ver las reglas necesarias que siguen la siguiente estructura:

ExpiresByType [tipo mime] “access plus [numero] [franja]”

La franja permite una de las siguientes opciones: (year,month,week,day,hour,minute,second).

Esta técnica que ofrecemos es muy recomendada por Google y Gtmetrix, esperamos que les sea útil, déjanos saber tu experiencia.

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