Diagram disable adds overhead in certain cases

I was doing some timing tests of two ways to do the same thing – a typecast and flatten to string. Well, in the process I saw a discrepancy when a diagram disable structure was wrapped around a typecast. Without the diagram disable, 1000000 iterations took 274 msec. With a diagram disable around the same thing, it took 1485 msec.
This scared me a bit, because technically the diagram disable case should be no different (ok, maybe a small overhead). It further scared me, because the same overhead is invisible with flatten to string. Inconsistent behavior…
The vi that clearly shows the “bug” in 8.0.1 is attached.
This is not a show stopper, but says “use the diagram disable structure with caution”.
Thoughts?
Attachments:
Diagram Disable Bug.vi ‏24 KB

Apparently that wasn't the only case where Diagram Disable behaves differently than just having the code inline. I also was investigating the performance of certain VIs, because I wanted to know if variant operations were faster than flatten/unflatten to/from string.
In the following snippet, I set the number of loop iterations to 100 and ran the VI, resulting in an Elapsed Time of ~50ms. I then moved the 'To Variant' VI inside the Enabled structure for both cases (Disabled and Enabled), and running the VI again resulted in an elapsed time of over 2 seconds! The source code should be identical in both cases, but it appears as though there is some optimization occuring in the first case that is not occurring in the 2nd case. It's as though in the first case, the compiler is smart enough to realize that the loop output does not change from iteration to iteration, but in the 2nd case it gets stupid.
So continue to beware of the Diagram Disable structure...
Attachments:
benchmark.png ‏71 KB

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Start from here (attached VI):
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Attachments:
Diagram Disable Cosmetic Bug.vi ‏4 KB

Actually, this also occurs with For Loops as well:
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method if_ex_hrbas00infty~before_output.
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Hello kpmolinarivera,
The iTunes Store country can be changed in Settings > iTunes & App Stores > Apple ID: > View Apple ID > Country/Region.
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http://support.apple.com/kb/HT1311
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How do i get my code to be applicable in a certain case only

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method if_ex_hrbas00infty~before_output.
Ensure that this validation only occurs for this user
check sy-uname = 'LMANDIMIKA'.
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endloop.
endmethod.
Edited by: Lovemore Mandimika on May 14, 2008 10:36 AM

Hello kpmolinarivera,
The iTunes Store country can be changed in Settings > iTunes & App Stores > Apple ID: > View Apple ID > Country/Region.
iOS: Changing the signed-in iTunes Store Apple ID account
http://support.apple.com/kb/HT1311
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Diagram disable adds overhead in certain cases

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