# How dose llcreader work for reading LLC4320?

**URL:** <https://discourse.pangeo.io/t/how-dose-llcreader-work-for-reading-llc4320/2640>\
**Category:** Uncategorized\
**Created:** [August 5, 2022, 12:09am UTC](https://discourse.pangeo.io/t/how-dose-llcreader-work-for-reading-llc4320/2640 "2022-08-05T00:09:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lei](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.pangeo.io/lei/32/1390_2.png) [@lei](https://discourse.pangeo.io/u/lei)\
**Post date:** [August 5, 2022, 12:09am UTC](https://discourse.pangeo.io/t/how-dose-llcreader-work-for-reading-llc4320/2640/1 "2022-08-05T00:09:33Z")

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Hi, everyone.  
I am trying to use `llcreader` for reading the LLC4320. I have some questions:

- How dose `llcreader` work when loading llc4320 data? I have this question because it works pretty slow when extracting longer time series (like 100 slices) for single variable at single level. Dose the `llcreader` load the whole LLC4320 file (more than 40GB) every time? If so, that will be absolutely slow.
- Will the cloud computing at Pangeo fast for such processing?

And finally I just face a struggling choice : could the Pangeo cloud or `llcreader` methods be suitable for preparing a PhD degree which needs long time supporting and extensive computing.

Thanks