# cmake -E env much slower than plain env
**URL:** https://discourse.cmake.org/t/cmake-e-env-much-slower-than-plain-env/2676
**Category:** Development
**Created:** [February 3, 2021, 2:52am UTC](https://discourse.cmake.org/t/cmake-e-env-much-slower-than-plain-env/2676 "2021-02-03T02:52:45Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@craig.scott](https://discourse.cmake.org/u/craig.scott)
#### Post date: [February 3, 2021, 2:52am UTC](https://discourse.cmake.org/t/cmake-e-env-much-slower-than-plain-env/2676/1 "2021-02-03T02:52:45Z")
I was made aware of the following commit by the ccache maintainer. Apparently the raw `env` command is way faster than `cmake -E env`, which I guess is understandable. If you use `cmake -E env` a lot in a project, I guess maybe this could add up. I don’t know if we use it heavily internally within CMake for user projects, at least not enough to be noticeable outside use cases like those for launchers like ccache.
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### Author:  [@ben.boeckel](https://discourse.cmake.org/u/ben.boeckel)
#### Post date: [February 3, 2021, 2:45pm UTC](https://discourse.cmake.org/t/cmake-e-env-much-slower-than-plain-env/2676/2 "2021-02-03T14:45:46Z")
Can we get a profile of what takes so long? Is CMake still looking for `CMAKE_ROOT` and the like even when in `-E` mode?
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### Author:  [@Dakon](https://discourse.cmake.org/u/Dakon)
#### Post date: [February 3, 2021, 3:37pm UTC](https://discourse.cmake.org/t/cmake-e-env-much-slower-than-plain-env/2676/3 "2021-02-03T15:37:39Z")
You should be able to get them yourself easily I guess:
$ time env FOO=BAR true
real 0m0,001s
user 0m0,001s
sys 0m0,000s
$ time cmake -E env FOO=BAR true
real 0m0,006s
user 0m0,006s
sys 0m0,000s