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Advice on how to improve website speed / performance

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An ad-hoc client of mine has reached out for advice on how to improve their website performance and load speed, and being completely honest I'm not 100% sure what to suggest aside from the obvious (remove unnecessary code and make sure images are optimised). 

They have some videos embedded from YouTube on their site and ALOT of pages (mainly blogs), but the main areas flagging on the page speed test are: 

  • Avoid large layout shifts
  • Minimize main-thread work
  • Reduce the impact of third-party code
  • Largest Contentful Paint element 15,480 ms
  • Avoid an excessive DOM size
  • Preload Largest Contentful Paint image Potential savings of 240 ms
  • Reduce unused JavaScript
  • Eliminate render-blocking resources
  • Reduce unused CSS
  • Serve images in next-gen formats
  • Reduce JavaScript execution time

They are actually failing the desktop 'Core Web Vitals Assessment' due to 'Cumulative Layout Shift' and this is the main area that I'm not sure what to suggest. (link here - https://pagespeed.web.dev/analysis?url=https%3A%2F%2Fwww.invoyage.net%2F)

They have good traffic to their website, and SEO & Accessibility is great. I wondered if anyone specialises in a purely performance aspect that I can recommend them to, or if anyone has any suggestions? 

Thanks so much! 


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