Just went live with the site, but got an F (23%) on my Page Speed Score and a D (64%) for YSlow. Top 2 recommendations were :
1. Defer parsing of JavaScript
550.9KiB of JavaScript is parsed during initial page load. Defer parsing JavaScript to reduce blocking of page rendering.
and
2. Enable gzip compression
Compressing the following resources with gzip could reduce their transfer size by 3.1MiB (80% reduction).
A lot of these are plugins specially downloaded for the Theme. Any suggestions on improving performance ?