# Trouble installing cylc-8.1.0?

**URL:** <https://cylc.discourse.group/t/trouble-installing-cylc-8-1-0/584>\
**Category:** Cylc Support\
**Created:** [January 24, 2023, 8:03pm UTC](https://cylc.discourse.group/t/trouble-installing-cylc-8-1-0/584 "2023-01-24T20:03:10Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![hilary.j.oliver](https://yyz2.discourse-cdn.com/free1/user_avatar/cylc.discourse.group/hilary.j.oliver/32/4_2.png) [@hilary.j.oliver](https://cylc.discourse.group/u/hilary.j.oliver)\
**Post date:** [January 24, 2023, 10:50pm UTC](https://cylc.discourse.group/t/trouble-installing-cylc-8-1-0/584/2 "2023-01-24T22:50:23Z")

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Hi @bencash,

Yes, unfortunately the conda environment solver seems to be really (and increasingly?) slow.

I just tried it myself and quit after waiting 30 mins.

You should use the new fast solver `mamba`:

```plaintext
$ conda create -n cylc8
$ conda activate cylc8
$ conda install -c conda-forge mamba
$ time mamba install -c conda-forge cylc-flow cylc-uiserver
...
real 0m50.282s
user 0m17.975s
sys 0m2.604s

$ cylc version
8.1.0

```

That took 50 seconds including solve, download, and install 🎉

I’ll suggest to the team that we update our installation instructions to include this advice.

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_[View the full topic](https://cylc.discourse.group/t/trouble-installing-cylc-8-1-0/584)._