woocommerce session

hello, i am using a currency switcher which allow the customer to browse and check out with his local currency, the problem i am facing is that the currency selection rest when moving from page to another. i have tried 3 plugins all same result. i then after realized that its something in customer session, when i use session data the server become very slow to response specially the first byte, and when i use transit data the currency selection rest when moving from page to another. Any solution? is there any way to make the transit data linked to the next page or any page link in the store?

Regards

https://ww.wp.xz.cn/plugins/woocommerce/