I have checked your site in the page insight chrome tool. your website score is very low.
implement the lazy sizes because it’s quite complicated for non-technical people.
You need to work on the following points :
- Theme Upgrade if there is a scope and upgraded theme available
- Reduce JS Payload.
- Use Critical CSS.
- Replace GIFs With Static Images
- Reduce Large Image Sizes
- Migrate Tracking Codes To Google Tag Manager
- Compress Images
- Limit Third-Party JavaScript & Shopify Apps
- Preload Web Fonts.
- I suggest limiting it to one and using a standard web font.
Theme Upgrade :
Its benefits include improved loading speeds, which can help with both user experience and store conversion rates, and search engine optimization.
Refer to this blog :
By fixing these issues, your website speed score can definitely improve.
For more details please check the link below.
https://www.oscprofessionals.com/blog/shopify-speed-optimization-guide/
If anything needs to be included or clarified then feel free to ask. We will surely help you.
Have a nice day!