topic Re: ~5 seconds delay in attachment request in ArcGIS Enterprise Questions

~5 seconds delay in attachment request

malte — Fri, 20 Mar 2026 12:29:50 GMT

Hello,

I am currently dealing with the following problem: We recently moved our Enterprise deployment to new servers and upgraded to 11.5. Since then, requesting attachments via the REST endpoint of a feature service (e.g. layers/0/features/401/attachments/1) consistently takes around 5 seconds, regardless of the attachment size, which is much slower compared to before. This only applies to the services that reference a postgresql sde, not hosted feature layers. The delay also occurs when I bypass the web adaptor and query via the arcgis server machine directly. Uploading attachments also seems to suffer from the same delay. ArcGIS Server logs the request as taking only a few hundredths or tenths of a second, including the database query, as I would expect, but then it takes ~5 more seconds for the server to actually send the response.

The server runs on Windows Server 2025. I already tried disabling defender temporarily, but no success.

Hope someone can help, thanks in advance.

Re: ~5 seconds delay in attachment request

George_Thompson — Fri, 20 Mar 2026 13:13:37 GMT

In the new architecture, is the PostgreSQL geodatabase in the same location as the new 11.5 machines?

Is this in a cloud deployment or local?

Not sure I have an answer but curious.

Re: ~5 seconds delay in attachment request

malte — Mon, 23 Mar 2026 12:10:41 GMT

The deployment is on premise, using VMWare. The PostgreSQL is on the same Host as the Enterprise deployment, but on a different VM. It's the same configuration as before the migration.

Re: ~5 seconds delay in attachment request

George_Thompson — Mon, 23 Mar 2026 12:19:59 GMT

What do the resources on host look like?

After the upgrade, is the deployment using more resources (RAM / CPU)?

With that delay on the server side, it seems that it is waiting for the server machine to respond.

Random question: are the 11.5 machines fully patched?

Re: ~5 seconds delay in attachment request

malte — Mon, 23 Mar 2026 15:27:22 GMT

The host resources look fine, plently still available.

We did have some issues after the migration because of low virtual memory on the arcgis server machine, but this has since been resolved and did not solve the issue.

All enterprise components are fully patched.

Re: ~5 seconds delay in attachment request

George_Thompson — Mon, 23 Mar 2026 15:33:16 GMT

Thanks for that information. This may be a case to work with technical support on a deeper investigation.

Re: ~5 seconds delay in attachment request

David_McRitchie — Thu, 26 Mar 2026 16:20:58 GMT

One thing I have seen add to response times are change tables. If a service has been up for some time, and had a lot of edits in its lifespan it could have grown large, and be less reactive.

Do you get the same response time if you publish a new test layer and try to request an attachment?

Ruling out if this is database specific or service specific will help address the problem.

Hope that gives some further help,

David

Re: ~5 seconds delay in attachment request

malte — Mon, 20 Apr 2026 07:34:18 GMT

Hi David,

I now had time to test a bit more, but without success. I created a new VM, installed the latest supported postgresql version, created a new SDE and published a new service, still the same problem.

I've now created a ticket with technical support.

Re: ~5 seconds delay in attachment request

MarcoHochuli — Wed, 27 May 2026 13:02:33 GMT

Same issue here with Enterprise 11.3 and SQL Server SDE.
Esri technical support was not able to recreate this issue on their testing infrastructure.
Do you have any new informations?

Re: ~5 seconds delay in attachment request

MortenR — Wed, 27 May 2026 13:08:17 GMT

We're experiencing these exact issues as well

Querying attachments on mapservices is ok
Querying attachments on featureservices takes 5 seconds

Any request on /uploads/ for the feature service takes 5 seconds, and /uploads/info/ for some reason takes 10 seconds.

This is happening in all our 11.3 and 11.5 environments, and only affect referenced services, not hosted.
We currently have one environment left on 10.9.1 that does not have this problem.

Re: ~5 seconds delay in attachment request

malte — Fri, 05 Jun 2026 13:02:38 GMT

I have no news, for me technical support was not able to reproduce it as well. The bug is tracked here: https://support.esri.com/en-us/bug/querying-referenced-feature-service-attachments-perform-bug-000182721