# ADS performance degradation?

**URL:** <https://forum.ecmwf.int/t/ads-performance-degradation/7160>\
**Category:** CAMS - Access and Login\
**Tags:** cams, ads\
**Created:** [23 October 2024 14:26 UTC](https://forum.ecmwf.int/t/ads-performance-degradation/7160 "2024-10-23T14:26:29Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Igor\_Oliveira](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/i/94ad74/32.png) [@Igor\_Oliveira](https://forum.ecmwf.int/u/Igor_Oliveira)\
**Post date:** [23 October 2024 14:26 UTC](https://forum.ecmwf.int/t/ads-performance-degradation/7160/1 "2024-10-23T14:26:29Z")

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Hi all,

I have noticed a significant degradation in performance of the CAMS data downloads. In the plot below you can see the duration of requests in the past few days for a specific request I normally do. Is there any known issue happening ?

Thanks

 ![cams_data](https://forum.ecmwf.int/uploads/default/original/1X/58e05c8f5f236964faa56e8e70490268180381b5.png)

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**Author:** ![Luke\_Jones](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/l/e0b2c6/32.png) [@Luke\_Jones](https://forum.ecmwf.int/u/Luke_Jones)\
**Post date:** [23 October 2024 16:17 UTC](https://forum.ecmwf.int/t/ads-performance-degradation/7160/2 "2024-10-23T16:17:15Z")

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Hi Igor. We are aware of the problem, but your very informative graph is useful confirmation. We’re trying to find the cause of the issue.

Luke.

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**Author:** ![Eduardo\_Araujo](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/e/9fc348/32.png) [@Eduardo\_Araujo](https://forum.ecmwf.int/u/Eduardo_Araujo)\
**Post date:** [23 October 2024 17:11 UTC](https://forum.ecmwf.int/t/ads-performance-degradation/7160/3 "2024-10-23T17:11:52Z")

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Hello, I noticed a long download time for the ‘reanalysis-era5-single-levels’ product. Is this product also having the same problem as CAMs data?

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**Author:** ![Igor\_Oliveira](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/i/94ad74/32.png) [@Igor\_Oliveira](https://forum.ecmwf.int/u/Igor_Oliveira)\
**Post date:** [24 October 2024 15:34 UTC](https://forum.ecmwf.int/t/ads-performance-degradation/7160/4 "2024-10-24T15:34:20Z")

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![download](https://forum.ecmwf.int/uploads/default/original/1X/d1d406a66dc40bfe090108570d27a86371c5525d.png)

Thanks for the reply Luke. I noticed that recent requests seems to be returning to the usual duration, fyi.

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**Author:** ![Luke\_Jones](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/l/e0b2c6/32.png) [@Luke\_Jones](https://forum.ecmwf.int/u/Luke_Jones)\
**Post date:** [24 October 2024 16:56 UTC](https://forum.ecmwf.int/t/ads-performance-degradation/7160/5 "2024-10-24T16:56:36Z")

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Great! We’ve taken some measures to improve the situation so let’s hope it stays this way now.

Eduardo Araujo - I think the CAMS data experienced some quite specific problems which aren’t shared by ERA5, so probably not related.

Luke.

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**Author:** ![Amy\_Stidworthy](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/a/eb9ed0/32.png) [@Amy\_Stidworthy](https://forum.ecmwf.int/u/Amy_Stidworthy)\
**Post date:** [4 November 2024 10:19 UTC](https://forum.ecmwf.int/t/ads-performance-degradation/7160/6 "2024-11-04T10:19:13Z")

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None of our ADS API requests from this morning have succeeded yet. Is there another data access issue?

Thanks,  
Amy

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**Author:** ![Luke\_Jones](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/l/e0b2c6/32.png) [@Luke\_Jones](https://forum.ecmwf.int/u/Luke_Jones)\
**Post date:** [4 November 2024 11:26 UTC](https://forum.ecmwf.int/t/ads-performance-degradation/7160/7 "2024-11-04T11:26:17Z")

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Hi Amy. The system got stuck this morning, but it’s unstuck now and you should find your requests are running or will run soon.

Luke.