You are adviced to use optimized script on your hosting account. If you are still facing the issue with any theme, you can check if the following things are enabled/added on your WordPress platform.
[*]WP Super Cache - You can enable all possible cache and minify settings. This doesn't load up.
[*]Use CloudFlare and it's minifying settings.
[*]Optimize your images
You can use above methods to make sure your website loads faster and you don't get CPU warnings.