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**Performance regression in the optimiser**\r\n\r\nI noticed that [upgrading Scala.js to v0.6.20](https://github.com/sparsetech/pine/commit/831541e0ff886c604db3b444286c1066ecc39185) increased the time of running our test suite by ~60%.\r\n\r\nThis regression can be reliably reproduced with the following commands:\r\n\r\n```bash\r\ngit clone git@github.com:sparsetech/pine.git\r\ncd pine\r\n\r\ngit checkout 284b857d0d0233966d2793d9c30e07a9434d724d  # Last commit before the upgrade\r\nsbt clean && sbt pineJS/test  # Takes 29s\r\n\r\ngit checkout 831541e0ff886c604db3b444286c1066ecc39185  # First commit after the upgrade\r\nsbt clean && sbt pineJS/test  # Takes 46s\r\n```\r\n\r\nIt seems that the optimiser stage takes considerably longer. I opened a [similar issue before](https://github.com/scala-js/scala-js/issues/2943) which may be related."},"comment":{"url":"https://api.github.com/repos/scala-js/scala-js/issues/comments/428317406","html_url":"https://github.com/scala-js/scala-js/issues/3123#issuecomment-428317406","issue_url":"https://api.github.com/repos/scala-js/scala-js/issues/3123","id":428317406,"node_id":"MDEyOklzc3VlQ29tbWVudDQyODMxNzQwNg==","user":{"login":"gzm0","id":1140323,"node_id":"MDQ6VXNlcjExNDAzMjM=","avatar_url":"https://avatars3.githubusercontent.com/u/1140323?v=4","gravatar_id":"","url":"https://api.github.com/users/gzm0","html_url":"https://github.com/gzm0","followers_url":"https://api.github.com/users/gzm0/followers","following_url":"https://api.github.com/users/gzm0/following{/other_user}","gists_url":"https://api.github.com/users/gzm0/gists{/gist_id}","starred_url":"https://api.github.com/users/gzm0/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gzm0/subscriptions","organizations_url":"https://api.github.com/users/gzm0/orgs","repos_url":"https://api.github.com/users/gzm0/repos","events_url":"https://api.github.com/users/gzm0/events{/privacy}","received_events_url":"https://api.github.com/users/gzm0/received_events","type":"User","site_admin":false},"created_at":"2018-10-09T19:19:13Z","updated_at":"2018-10-09T19:19:13Z","author_association":"CONTRIBUTOR","body":"It seems like we can live with this in v1.0.0 and we can fix this in a binary compatible manner. @sjrd unless you have any objections, I'll move this post-v1."}}
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