How to speed up DISM on Windows

I am executing a cmd file from a  Installshield Installscript custom action (this is a Basic MSi installer, not a Suite installer). The cmd file sets 23 windows features, and takes 15\18 minutes.  How to speed things up?    Here is an example of two of the lines...

%Windir%\system32\Dism /online /Enable-Feature /NoRestart /FeatureName:IIS-WebServerRole
%Windir%\system32\Dism /online /Enable-Feature /NoRestart /FeatureName:IIS-HttpRedirect

Is powershell faster (and are the feature names the same in powershell)?

In either case, cmd\dism or Powershell, will it speed things up if I determine if the feature is already enabled, and thus do not execute the command to enable that feature?  If so, how to do this, please give exact example.  Thanks.
eelouAsked:
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JohnBusiness Consultant (Owner)Commented:
How long does it take?  For me, 15 to 20 minutes seems to do it (a bit shorter for Check Health and a bit longer for Restore Health). Powershell is not going to speed this up as DISM is doing its checking from the program. If you are within the limits above, that is what it takes.

DISM is a heavy duty repair program and takes time.
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eelouAuthor Commented:
Will determining if already enabled, and if already enabled don't try to enable again, speed things up?
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JohnBusiness Consultant (Owner)Commented:
DISM is a stand alone program. It will take the same amount of time to run a second or third time. It is like System File Checker only it does more and takes long. If you can run the whole thing in a half hour or less, that is normal.
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JohnBusiness Consultant (Owner)Commented:
@eelou  - Thanks and I was happy to help.
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