Hi there, Matt Sergei (do call me Matt again) and am repeating the bid (25 years a webmaster, scripting SVG for 7+ years, know SVG 1.1 specification and its cross-browser support to the letter).
I see you doubt about SVG experts. I've checked your codePen as well now. So only few keywords here: menus, working thread, Safari energy saving.
The original website has two issues for that, one is CSS based and the other is performance based.
But my experience is worth 1/3th of my daily rate.
Regards,
Matt