If the slowdown confirms, I think it is caused by this commit: nodejs/node@8c4b8b2

That function (validationFunction) can be the issue, is used by 63 files, if it confirms, that thing slowdown a bunch of other things too.

The definition of that function can be found here: https://github.com/nodejs/node/blob/284e6ac20cc5afe39a0ffeea90b8684f6803d232/lib/internal/validators.js#L419-L422

The difference is now he hides the stackframe.

Edit: The source code of hideStackframe can be found here: https://github.com/nodejs/node/blob/284e6ac20cc5afe39a0ffeea90b8684f6803d232/lib/internal/errors.js#L411-L417

Reading the code, I don't think that function can be the issue but is to only significant thing that changed between NodeJS Versions.