My guess is we'll find the performance issues in the fixed point evaluation of the compiler. [node-inspector](https://github.com/dannycoates/node-inspector) will be useful here. ## <bountysource-plugin> Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/825335-profile-to-find-performance-weak-points?utm_campaign=plugin&utm_content=tracker%2F33145&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F33145&utm_medium=issues&utm_source=github). </bountysource-plugin>