WordPress Mobile Speed Optimization

I am developing a new website on a temporary domain, and need to optimize the loading speed for mobile, mostly on one specific page which contains the booking form itself.

Key Requirements:
- Optimize mobile loading speed, focusing on initial load time.
- It involves text and images.
- It also involves a custom made plugin used to book my activities.

Ideal Skills and Experience:
- WordPress development expertise
- Proven experience in mobile speed optimization
- Familiarity with tools like GTmetrix or Google PageSpeed Insights
- Strong understanding of image optimization and resource minification

Looking for a freelancer who can ensure a fast, smooth user experience on mobile.