Hi mrwaimanwong,
Sorry you are having this issue. From what I know, VPC’s speed actually depends on several factors, including the size of the images used in the options, and even on whether the server you are using meets the minimum requirements VPC needs to run efficiently.
I have checked the site you need help with and the error I came across is linked to your theme’s JS assets:
Uncaught TypeError: Cannot use ‘in’ operator to search for ‘Object’ in undefined
at https://staging.rextrophies.com/wp-content/themes/rextrophies/assets/js/vendor.min.js?ver=1553628889:1
Perhaps there is a conflict? I usually try one of the default themes if I come across such issues, to see if it is the same error I get.
I advise you do the same, and also ensure that the staging server you are using meets the VPC plugin requirements. Above all, I advise that you reach out to support via the website live chat.
Please let me know how things go.
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This reply was modified 5 years, 5 months ago by daydah. Reason: Reference to plugin developer's support added