Update content inside cache tag
Because your content is cached it "downloads" your website so it loads quick. 
This can be fixed by disabling cache to users that are logged in or maybe even certain users. This way you "bypass" the cache so you see the changes as soon as your page is loaded.

unless #

Prevents the {% cache %} tag from activating if a certain condition is met.

{# Don't cache if someone is logged in #}
{% cache unless currentUser %}


You can find the cache options in the docs. 

Source: https://craftcms.com/docs/templating/cache