Try to disable all the third-party plugins (including cache plugins), that does not come bundled with XStore https://xstore.helpscoutdocs.com/article/36-included-plugins , clear the cache of the browser, and check then. Maybe one of the additional plugins is a reason for the problem.
There is no the mentioned problem, on our demos or test sites, so it seems there is something on your site that caused the delay in loading.
If it is not caused by plugins, check additional customization in files.
Regards 8Themes Team.
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