# Monad Transformers and Effects with Backpack

**URL:** <https://discourse.haskell.org/t/monad-transformers-and-effects-with-backpack/1689>\
**Category:** Show and Tell\
**Created:** [December 24, 2020, 12:36pm UTC](https://discourse.haskell.org/t/monad-transformers-and-effects-with-backpack/1689 "2020-12-24T12:36:48Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ocharles](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.haskell.org/ocharles/32/102_2.png) [@ocharles](https://discourse.haskell.org/u/ocharles)\
**Post date:** [December 24, 2020, 12:36pm UTC](https://discourse.haskell.org/t/monad-transformers-and-effects-with-backpack/1689/1 "2020-12-24T12:36:48Z")

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Hi all! I’ve just published a new blog post, demonstrating a performance problem that can come with `mtl`-style code, and how we can solve this using Backpack. Enjoy!

> **[Monad Transformers and Effects with Backpack](https://blog.ocharles.org.uk/posts/2020-12-23-monad-transformers-and-effects-with-backpack.html)**