I saw many updates and maybe you can tell us if this should not occur at this moment?

I attached my response from wpx hosting, blazing fast hosting and great service so I don't want to move my sites..

Response about high CPU usage after using the mailpoet plugin-----

Thank you for reaching out.

I have reviewed the issue and managed to identify that it is caused due to maxed out resource usage for your whole Hosting Service.

Based on our monitoring I noticed that the site with mailpoet plugin is using at least 70% of the total resource usage for your Hosting Service.

The requests that are maxing out the CPU usage are mainly made by the "Mail Poet" cronjob:

- [01/Jun/2020:07:07:27 +0100] "POST /?mailpoet_router&endpoint=cron_daemon&action=run&data=eyJ0b2tl
biI6IjE2dnQ0In0 HTTP/1.1" 200 0 "/?mailpoet_router&endpoint=cron_daemon&action=run&data=eyJ0b2tlbiI6IjE2
dnQ0In0" "MailPoet Cron" "PHP/7.3.17" 25
- [01/Jun/2020:07:07:46 +0100] "POST mailpoet_router&endpoint=cron_daemon&action=run&data=eyJ0b2tl
biI6IjFxaHNsIn0 HTTP/1.1" 200 0 mailpoet_router&endpoint=cron_daemon&action=run&data=eyJ0b2tlbiI6IjFx
aHNsIn0" "MailPoet Cron" "PHP/7.3.17" 25

Each one of those requests is taking more than 25 seconds which is quite a lot.

I would advise you to deactivate the plugin or the specific reoccurring functionality because it will cause issues to other sites as well.