I’m using WP User Avatar Pro (contact me for purchase code) on a site whose pages normally load within 1.5 or 2 seconds.
However when I use the avatar tool on the WooCommerce my account page, it can take over 10 seconds after cropping the uploaded image and clicking the save icon, before the dialog disappears and the avatar is shown on the page. I’m using quite small images, no larger than 1Mb.
If you go to https://www.homeworks.com.mt/account/ you can create an account and have a go.
If you need more info let me know.