What is meant by BLOB cache in SharePoint and where it is configured?

Disk-based Caching for Binary Large Objects Disk-based caching is extremely fast and eliminates the need for database round trips. BLOBs are retrieved from the database once and stored on the Web client.

One website has video. I open the website at 1:00 PM so it has taken 20 sec time to load website since video there. Next time 1:10 PM I refreshed that website so the video again load and take same 20 sec. if you need to reduce the 20 sec to less time, you can implement the BLOB. BLOB check that already open and it will not load video again. implement BLOB in web.config.

SharePoint Server 2013 provides a disk-based binary large object (BLOB) cache that reduces database load and increases browser performance for users. SharePoint Server 2013 provides a disk-based binary large object (BLOB) cache that reduces database load and increases browser performance for users. The BLOB cache is configured in the web.config file for each web application.