Specifically: advices on loading third party JS :
third-party script is slowing down your page load, you have several options to improve performance:

• Load the script using the async or defer attribute to avoid blocking document parsing.
• Consider self-hosting the script if the third-party server is slow.
• Consider Resource Hints like <link rel=preconnect> or <link rel=dns-prefetch> to perform a DNS lookup for domains hosting third-party scripts.
• "Sandbox" scripts with an iframe
• lazy-load content after the main page content loads but before a user might otherwise interact with the page