What happened?

The query to get a list of instances in a local study in Orthanc Raw is sometimes very slow (10+ minutes) and leads to Timeout errors in the imaging api.

Relevant log output (optional)

No response

What did you expect? (optional)

I would expect the call to /studies/id/instances should return within the HTTP timeout limit.

I've tried:

• calling different endpoints (e.g. /studies/series to get a list of series in the study and then /series/instances to get the instances in a series, but the call to /series/instances is very slow if there are a large number of instances in the series)
• specifying only the SOPInstanceUID tag should be returned in the call to /study/id/instances (although all MainDicomTags are still returned)
• making the call to /studies/id/instances synchronously

but none of these to solve the issue. We should perhaps use the DICOM timeout in this api call so we at least don't run into the timeout issues.