JS-based crypto VERY slow since 7.0 update?

Hi,

I tried using two services with JS-based crypto in Tor Browser 7.0, and they are suddenly VERY slow - they work, but only after a long delay, much longer than before.

Try: https://cryptodog.github.io/cryptodog/

Or logging into ProtonMail:

protonmail.com or https://protonirockerxow.onion/

I am using 64 bit Fedora 24 with the GNOME Wayland desktop.

Trac:
Username: jiminycricket