As I have verified your page, is properly cached using W3 Total Cache:
Performance optimized by W3 Total Cache. Learn more: https://www.w3-edge.com/products/
Page Caching using disk
Minified using disk
Database Caching 3/111 queries in 0.213 seconds using disk
Served from: firstaed.com @ 2018-08-16 18:14:55 by W3 Total Cache
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However, I would suggest disabling database caching because if used with disk only, it may sometimes add extra loading times. Database cache is recommended to be used with Disk Enhanced.
I hope this helps.
