Sprout SEO Re-saving Entries and metadata CPU 100%
Sprout SEO is running the Craft provided ResaveElements task when you save the field. The same ResaveElements task will run if you resave your Section as Craft needs to make sure that if you updated the URL of a section that it saves the right URLs to the database for all entries. (Sprout SEO is doing something similar making sure it has saved metadata needed for output). We have seen sites with a large number of locales experience load when resaving all elements and have seen similar with the resaving of Sections. In all cases where we've seen this, increasing server resources has solved the problem.

In the case this is just caused by a series of one-off changes where things were resaved several times in a row, you could delete the tasks from the craft_tasks table and retrigger the events so they are not triggered multiple times and see if that helps.

The best long-term solution will probably be to increase the resources on your server to ensure things go smoothly.