After researching this topic extensively, I am unable to find a resolution.
Speed tests indicate this issue is drastically slowing our site. Any tips or suggestions would be greatly appreciated.
Hello @M72561,
Thanks for asking. 
Can you please let me know the URL? I checked your account and you have more then one URL attached. Please share the website URL for us to take a closer look.
Thanks.
Hi,
The problem seems to be related to the ?rev=5.4.8 suffix, which is the version of the items.
You could try using this plugin to remove suffix - https://wordpress.org/plugins/remove-query-strings-from-static-resources/
Please check this as well.

Thanks!
Thanks, we’ll give that a go.
You are most welcome. 
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