# JupyterLab is suddenly slow. Has anyone got the same situation or know the solution?

**URL:** <https://discourse.jupyter.org/t/jupyterlab-is-suddenly-slow-has-anyone-got-the-same-situation-or-know-the-solution/15048>\
**Category:** JupyterLab\
**Created:** [July 22, 2022, 6:11pm UTC](https://discourse.jupyter.org/t/jupyterlab-is-suddenly-slow-has-anyone-got-the-same-situation-or-know-the-solution/15048 "2022-07-22T18:11:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![hjh\_air\_cond](https://avatars.discourse-cdn.com/v4/letter/h/35a633/32.png) [@hjh\_air\_cond](https://discourse.jupyter.org/u/hjh_air_cond)\
**Post date:** [July 22, 2022, 6:11pm UTC](https://discourse.jupyter.org/t/jupyterlab-is-suddenly-slow-has-anyone-got-the-same-situation-or-know-the-solution/15048/1 "2022-07-22T18:11:15Z")

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Hello Everyone!

I’m using jupyterlab on our lab’s CentOS system server, and the jupyterlab(v3.3.2), python and R kernel were all installed in a codna environment built by conda 3.0. Normally I ssh to the server and port forwarding the jupyterlab port to the localhost port, and it works just well for the last 6 months

Recently I just create a new conda env with conda 4.0+ and install the jupyterlab 3.4.4. It can be ported but it works very slow all of a sudden, like it will takes 15 to 20 seconds to change to the Render View( shift + R) or move one cell to another position, or split cells.

Also these kind of things happened when I swich back to the old conda env and jupyterlab 3.3.2, and also on Edge and Chrome browser. So I cant figure out the problem.

Has any one got the same issues? Or know how to solve this problem?

Thanks!

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**Author:** ![krassowski](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/krassowski/32/1685_2.png) [@krassowski](https://discourse.jupyter.org/u/krassowski)\
**Post date:** [July 24, 2022, 2:49pm UTC](https://discourse.jupyter.org/t/jupyterlab-is-suddenly-slow-has-anyone-got-the-same-situation-or-know-the-solution/15048/2 "2022-07-24T14:49:35Z")

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I was seeing some performance degradation recently, but could not narrow it down. Does it also happen in Firefox? For me Firefox was not affected.

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**Author:** ![hjh\_air\_cond](https://avatars.discourse-cdn.com/v4/letter/h/35a633/32.png) [@hjh\_air\_cond](https://discourse.jupyter.org/u/hjh_air_cond)\
**Post date:** [July 28, 2022, 5:10pm UTC](https://discourse.jupyter.org/t/jupyterlab-is-suddenly-slow-has-anyone-got-the-same-situation-or-know-the-solution/15048/3 "2022-07-28T17:10:58Z")

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Hi! Thannks for your reply!

In my situation, those thing also happened when I use Firefox.

And also last time I didn’t mentioned, because I arrange the jupyter-lab in one of the Computation Node under the Management Node(which means I can ssh to the computation one from the management), I have to use ProxyCommand when I port forwarding.

So one of my colleague suggest me to use the Tunneling funtion in Xshell software, and I do so. It turns out jupyter-lab will be a little bit faster.

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**Author:** ![hjh\_air\_cond](https://avatars.discourse-cdn.com/v4/letter/h/35a633/32.png) [@hjh\_air\_cond](https://discourse.jupyter.org/u/hjh_air_cond)\
**Post date:** [July 29, 2022, 4:36pm UTC](https://discourse.jupyter.org/t/jupyterlab-is-suddenly-slow-has-anyone-got-the-same-situation-or-know-the-solution/15048/4 "2022-07-29T16:36:12Z")

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Hi! Thannks for your reply!

In my situation, those thing also happened when I use Firefox.

And also last time I didn’t mentioned, because I arrange the jupyter-lab in one of the Computation Node under the Management Node(which means I can ssh to the computation one from the management), I have to use ProxyCommand when I port forwarding.

So one of my colleague suggest me to use the Tunneling funtion in Xshell software, and I do so. It turns out jupyter-lab will be a little bit faster.