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The UAC elevation of my setup (MSI) takes too long (~20 seconds).
from here I understand that this could be due to long signature test.
My setup itself is not signed so I guess something else that gets into my setup is checked for signature.
Is there anyway to check what in my setup causing this and how to improve this issue?
Also is there any other issue that can be the cause of that delay in elevation? like maybe the Heuristic checks for elevation? Is there anyway to workaround that?
The article you mentioned offers a great explanation. So it should be your starting point.
The elevation request is handled by Windows Installer as part of your installation UI sequence. This sequence contains actions which are executed immediately one after another. The elevation is requested immediately, but it takes some time until Windows Installer processes it.
The only improvement you can try is using an EXE bootstrapper which doesn’t include the MSI. Like the article suggests, a smaller file should take less to check.
Please note that just because you are not using a digital signature it doesn’t mean that a check is not performed.