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Using the top command may help identify expensive processes exhausting CPU on your instance.
Given the issue manifests on both live site and dev sites that serve little traffic, it may point to an issue with your WordPress. With WordPress, many components can impact CPU usage such as: WordPress version, Plugins, Themes, WP-cron. You may want to identify when the CPU usage spiked and if it corresponds with installing or updating any of the above CP components.
You may also find cacheing or media offloading help alleviate CPU load. Offload and cacheing can be achieved through a variety of plugins, and possibly use of buckets or distributions. However, this sounds less likely as you mentioned the dev instance mirrors also being similarly impacted by CPU usage.
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Could you try to identify the processes that are causing the heavy CPU usage on your WordPress instances? That could provide some more hints as to what the issue is.
About the console slowness, are you experiencing this slowness on the console in general, or only on specific pages?