Dear @Kruczek WebHouse,
We hope this message finds you well. We are currently investigating the potential causes of the issue you have reported. Our team is diligently working to identify a solution and will provide you with an update as soon as possible.
In the meantime, we recommend reviewing recent discussions related to WordPress, as it appears that this issue may not be unique to the XStore theme. You may find the following topic particularly relevant: https://www.8theme.com/topic/issue-with-server-cpu-ram-since-last-update-not-the-first-post-to-report-this/#post-403080.
Also, it would helpful for us if you could check the CPU usage with the previous archives with XStore v.9.3.11 & XStore Core v.5.3.11 versions. If you are able to make such test, please give us a feedback and we will send you the archives for test.
Thank you for your patience and understanding. Should you have any further questions, please do not hesitate to contact us.
Best Regards,
Jack Richardson
The 8Theme Team