You can consider to caches static contents to the client with UseMaxAge if your website has too much static contents, and high traffic so for better performance and for saving your hosting account resource
Please copy the below code to the web.config file
<?xmlversion="1.0"encoding="UTF-8"?><configuration><system.webServer><staticContent><clientCachecacheControlMode="UseMaxAge"cacheControlMaxAge="1.00:00:00"/></staticContent></system.webServer></configuration>
