Our team copied a VM from one Azure subscription onto a new Azure subscription. This VM acts as a Clickhouse client. Both the original and the copied VMs share the same characteristics: Standard B4ms (4 vcpus, 16 GiB memory).
The newly created VM behaves properly, however I noted that it does not perform as well as the original VM. For instance, when trying to run a simple Clickhouse query, this is what both VMs return:
Original VM: Processed 2.45 million rows, 9.79 MB (125.86 million rows/s., 503.44 MB/s.) New VM: Processed 2.45 million rows, 9.79 MB (62.26 million rows/s., 249.03 MB/s.)
Do you have any idea what may cause this difference in performance?