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Upgrade to Node 8.12 to address CPU usage problems related to fibers #10117
Node has a bug fix related to performance with fibers, which is very important to Meteor. Without the fix applied, any Meteor process which creates a large number of fibers will become very slow; switching between fibers is O(n) in the peak number of concurrent fibers the process has ever contained.
The fix is present in Node 10.2.0 and later, and which will be in Node 8.12 as soon as they cut a release, which should be soon. Meteor is currently on Node 8.11, which is affected.
Node 8.12 release PR page: nodejs/node#21593