title: Proper way to setup a flag across entire site
body: <p>I have multiple partial views that must be shown if a flag is set to <code>true</code> accross the entire site.</p>
  
  <p>I have that flag hardcoded inside <code>appSettings</code> on my <code>web.config</code> file and is working nice. But now this flag must be set trough our back-end.</p>
  
  <p>The site has a lot of traffic and I need a proper way to reach that, I feel like making a SQL request just to check this flag is an overkill.</p>
  
  <p>I've though about reading a simple txt file containing the flag, but I dont know if it's still "too much".</p>
  
  <p>How would be the most optimized way?</p>