Hello @psysid,
I am sorry to hear you are facing such issues with your website.
Note that CPU seconds usage can be related to specific issue with a website or actions requiring too many time to execute. Additionally cache plugins such as SiteGround Optimizer can help but not in all cases. First you need to find the reason of the high CPU usage and then to verify if cache plugin will help or there are some other actions required on the matter.
As you are facing an issue with SiteGround hosting service rather than the SiteGround Optimizer plugin, please contact our representatives so further assistance can be provided.
Additionally please have in mind that this is WordPress forum and reviews should be strictly related to the plugin they are posted for.
Once your website is back online and issues are resolved it will be helpful to update this review and share more about the SiteGround Optimizer plugin experience.
Best Regards,
Elena