There exists a bug introduced in rails 4.2
where calling the url_helpers of an engine will parse the entire set
of routes again and create a new object, as a result there is a huge
slowdown when looping, calling the url_helpers object again and again.
As the url helpers are included in the base controller, these methods
are available anyways, calling them this way doesn't parse all the
routes.
Before: Completed 200 OK in 8337ms
After: Completed 200 OK in 542ms
There exists a bug introduced in rails 4.2 where calling the
url_helpersof an engine will parse the entire set of routes again and create a new object, as a result there is a huge slowdown when looping, calling theurl_helpersobject again and again.As the url helpers are included in the base controller, these methods are available anyways, calling them this way doesn't parse all the routes.