A fairly large Gravity Forms form at https://2018.americanbell.org/register is using 40% of CPU and more than 200MB of RAM when the browser tab is active. When the tab is inactive, the CPU usage drops to less than 1% and as low as 119MB memory. The form is extremely slow to complete and, in some tests, the browser tab crashes.
I installed Hummingbird and have brought the site score up to 91, but cannot figure out what is causing the heavy load.
I have enabled support access.