Web Performance Optimization for Restaurant Sites

Description:
I need a developer to review and fix technical performance issues on both my main restaurant website https://argosgreek.com/
) and my online ordering subdomain https://argos.revelup.online/
). The subdomain in particular is underperforming, and my GTmetrix report shows several areas that need attention.

Key Issues (from GTmetrix):

Subdomain page size too large (4.24 MB) → images need compression and optimization

Inefficient caching of static assets

Unused JavaScript and long main-thread tasks

403 POST error in the waterfall trace

Largest Contentful Paint is 4.0s (too slow, target <2.5s)

What I Need:

Audit and optimize both domain and subdomain for faster load times

Compress/convert images (WebP/AVIF) and implement lazy loading

Set up efficient caching policies for static files

Remove or defer unused JavaScript

Fix the 403 POST error on the subdomain

Deliver a mobile-friendly, lightweight, and faster user experience

Deliverables:

Fully optimized domain and subdomain

Before/after performance reports (GTmetrix / PageSpeed Insights) showing improvements

When Bidding, Please Share:

Your experience with website performance optimization

Your technical approach/tools to fix these issues

Examples of past projects where you improved PageSpeed/GTmetrix results