Adjusting image caching
You can choose the amount of time that your GitHub Enterprise Server instance caches avatars. When you increase the cache time, you increase the amount of time a user's avatar will take to load. Configuring the cache time with too low a value can overload your GitHub Enterprise Server instance work processes.
- From an administrative account on GitHub Enterprise Server, click  in the upper-right corner of any page.

 - In the left sidebar, click Management Console.

 - In the left sidebar, click Applications.

 - Under "Avatar image cache time (seconds)", type the number of seconds that you would like your GitHub Enterprise Server instance to cache avatar images.

 - Under the left sidebar, click Save settings.

 - Wait for the configuration run to complete.