Delayed site loading – sometimes….

Hello. Just upgraded to 2.4.7 and there is sometimes a delay in the site loading. I think there is a mistake in .htaccess set up of the cache so I ran it on redbot.org and received the following:

Content Negotiation(Content Negotiation response)

• The resource doesn’t send Vary consistently.

Plus more but, I think this may be the cause of the “sometimes” delayed site load. Is there anyone that can give me some feedback on what I may need to change?

****No matter how I saved the file on Reddit – it would add a lot of spaces and turn plain text into hyperlinks. It is now on Google docs at: https://docs.google.com/document/d/1l2AkkityroEVuSSze0B4VawTfgP65DKwXpncr8pyDOU/edit?usp=sharing