This is a serious issue. Per the admin's link above, you will get more accurate results by running Chrome Dev Tools locally... it's STILL an issue.
Here are instructions for creating a similar report through your Chrome browser: https://developers.google.com/web/tools/lighthouse#devtools
I'm wondering if anyone has created a template that eliminates the biggest offending scripts from SquareSpace? I would pay for this! Here's a list of the slowest scripts per my report [TIME DELAY]:
use.typekit.net.../ik/vK8u1-ck4….js [2,220 ms]
assets.squarespace.com…scripts-compressed/common-fc3e2ea…-min.en-US.js [3,870 ms]
assets.squarespace.com…scripts-compressed/commerce-74f3967…-min.en-US.js [2,550 ms]
static1.squarespace.com…159…/site.css?&filterFeatures=false [1,880 ms]
Total delay from these render-blocking resources = 10.52 seconds