Many requests submitted by other users may be running in parallel consuming the services resources (MARS slots, Web-API slots, Tapes access slots etc). These requests may be very useful to understand the efficiency factors.
Compare the activity of your requests to the other users activity using the MARS activity page.
See the reason that some requests are "queued" and how long they have been "queued".
Have a look on the MARS logs about limitations like:
"In marsod-core, the total number of Requests from ECMWF Web API with 1 tape mount [source] is limited to 6"
etc
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Many requests submitted by other users may be running in parallel consuming the services resources (MARS slots, Web-API slots, Tapes access slots etc). These requests may be very useful to understand the efficiency factors.