jouriena on "[Plugin: WooCommerce] Issue with admin-ajax.php, GET cart, and GET checkout in Woocommerce"

Hi,

I'm working on my Woocommerce website, and I'm having trouble with slow 'add to cart' and 'checkout'. Each of these pages take about 13-16 seconds to load...sometimes even longer.... This is quite a serious for an ecommerce site...

As I checked with GTMetrix and Pingdom (>> Waterfall), it seems that the slow load is mainly due to 'GET cart' for Cart page (about 7.8 seconds according to GTMetrix), and both 'GET checkout' and 'GET cart' for Checkout page (about 11 seconds according to GTMetrix).

On Pingdom, the wait on admin-ajax.php is about 7.0-7.5 seconds for both Cart and Checkout pages.

Please note on the following:
- I'm using WP Rocket as my cache plugin.
- I'm using Avada as my wordpress theme.
- My site has WPML installed.
- My site is on Inmotion VPS hosting plan.
- My site has Heartbeat Control installed and set to "Allow only on post edit pages" and "60 seconds" for override heartbeat frequency.
- My site's WP Memory Limit is 512MB
- Pingdome test location is Melboue, Australia.
- There are only variable products on my site.
- My site has many plugins, but according to GTMetrix and Pingdom, none of these plugins cause significant load to the page load as a whole. Indeed, their load is nowhere near the loads of GET cart and GET checkout.

Please advise.

https://wordpress.org/plugins/woocommerce/