# TrDoEffect. Not really TrConcat behavior **URL:** \ **Category:** ProffieOS\ **Created:** [July 22, 2024, 8:28am UTC](https://crucible.hubbe.net/t/trdoeffect-not-really-trconcat-behavior/5584 "2024-07-22T08:28:16Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![NoSloppy](https://crucible.hubbe.net/user_avatar/crucible.hubbe.net/nosloppy/32/3865_2.png) [@NoSloppy](https://crucible.hubbe.net/u/NoSloppy)\ **Post date:** [July 22, 2024, 8:28am UTC](https://crucible.hubbe.net/t/trdoeffect-not-really-trconcat-behavior/5584/1 "2024-07-22T08:28:16Z")
I guess I had always assumed, based on what it looks like, the TrDoEffect performed the transition, THEN triggered the effect. While finally using it a little bit now I see that’s not the case and just want to confim that the intended behavior is having the transition happen simultaneously as the triggering of the EFFECT, similar to how a TrJoin would do? If that’s the case, then it’s working as intended. And now that I look at the usage comments it does indeed say “Runs the specified TRANSITION and triggers EFFECT”, with “AND” being the key word. It doesn’t say “THEN triggers EFFECT” ---
**Author:** ![profezzorn](https://crucible.hubbe.net/user_avatar/crucible.hubbe.net/profezzorn/32/8_2.png) [@profezzorn](https://crucible.hubbe.net/u/profezzorn)\ **Post date:** [July 22, 2024, 8:32am UTC](https://crucible.hubbe.net/t/trdoeffect-not-really-trconcat-behavior/5584/2 "2024-07-22T08:32:13Z")
TrDoEffect triggers the effect and the transition at the same time. More technically: Triggering an effect takes no time, but any result of that effect will run in parallel with the transition. ---
**Author:** ![NoSloppy](https://crucible.hubbe.net/user_avatar/crucible.hubbe.net/nosloppy/32/3865_2.png) [@NoSloppy](https://crucible.hubbe.net/u/NoSloppy)\ **Post date:** [July 22, 2024, 8:33am UTC](https://crucible.hubbe.net/t/trdoeffect-not-really-trconcat-behavior/5584/3 "2024-07-22T08:33:37Z")
Thanks. Working as intended.