# compression of CZML file
**URL:** https://community.cesium.com/t/compression-of-czml-file/4388
**Category:** CesiumJS
**Created:** [July 18, 2016, 7:02am UTC](https://community.cesium.com/t/compression-of-czml-file/4388 "2016-07-18T07:02:16Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@MP11](https://community.cesium.com/u/MP11)
#### Post date: [July 18, 2016, 7:02am UTC](https://community.cesium.com/t/compression-of-czml-file/4388/1 "2016-07-18T07:02:16Z")
Hi,
I am loading a dynamically generated czml file (larger than 6MBs) and it takes considerable time to load.
Is there any compression tool/mechanism available for CZML like KMLs can be compressed into KMZs?
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### Author:  [@hannah](https://community.cesium.com/u/hannah)
#### Post date: [July 18, 2016, 2:41pm UTC](https://community.cesium.com/t/compression-of-czml-file/4388/2 "2016-07-18T14:41:40Z")
Hello,
Sorry, but I don’t think there is currently support for this. You could zip up the file and add code to unzip it in your application. Cesium uses [zip.js](https://gildas-lormeau.github.io/zip.js/) to unzip KML files.
Best,
Hannah
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### Author:  [@Matt\_Amato](https://community.cesium.com/u/Matt_Amato)
#### Post date: [July 18, 2016, 2:57pm UTC](https://community.cesium.com/t/compression-of-czml-file/4388/3 "2016-07-18T14:57:59Z")
CZML compression is “free” if you configure your server to use gzip compression. How this is done is different depending on what server you are using (IIS/Apache/node/etc…).
That being said, are you sure it’s transfer time that is the problem here?
Manually zipping/unzipping is a bad idea and should be avoided. It would actually increase load times in many cases.