Shopify Speed Optimization Expert Needed

I'm seeking a professional to enhance the speed of my Shopify store, particularly on the homepage. Currently, I'm facing issues like excessive main-thread work, idle JavaScript, and sluggish third-party code.

Key Tasks:
- Minimize main-thread work
- Reduce unused JavaScript
- Mitigate the impact of third-party code
- Decrease JavaScript execution time

The ultimate goal is to have green speed scores for both the mobile and desktop versions of my site.

Ideal Skills:
- Extensive experience with Shopify
- Proven track record in website speed optimization
- Proficient in JavaScript and understanding of main-thread work
- Ability to assess and optimize third-party code

Experience with Shopify is a must. Please provide examples of previous speed optimization projects and the results achieved.