Labview sub-vi performance enhancement is needed

Hello,
I have two sub-vi's in an attachment with this message that I could use some help with.  I've been told by a regional NI field sales engineer that they can be improved by a NI application engineer so that they will perform much faster.  Anyone able to help me out in a bind on short notice?  These sub-vi's are used to generate hexidecimal code with a check-sum that's used to control the functional mode of a CDMA microprocessor.  The code is passed through the serial port interface of the CDMA device and it needs to operate faster.
/BCU
/BCU002
Hardware Engineer•Design Reliability/Performance and Validation Group•Wavecom, Inc. - Research Triangle Park, N.C.•http://www.wavecom.com
Attachments:
Sub-vi.zip ‏54 KB

Altenbach,
Your re-creation of the original sub-vi seems to be a nice fit for my application and it does seem to run faster.  However now I'm not able figure out why the rest of the application isn't functioning properly.  The rest of my application runs through all of the subvi's very quickly now but once I get to the While Loop it stops working everything inside of it except for the two delays I'm using as on/off timers.  I've changed the VI properties of the sub-vi's that are being used in triplicate to 'reentrant' but that's not helping me like I expected.  Another odd thing is that I can't get the indicators on my top level panel to update and display the information I need from the While Loop.
I really need more help with this application because I've spetn all day and all evening trying to figure it out and I'm at a loss for understanding how to fix the problems.  Can you help me out of this mess?
/BCU002
/BCU002
Hardware Engineer•Design Reliability/Performance and Validation Group•Wavecom, Inc. - Research Triangle Park, N.C.•http://www.wavecom.com
Attachments:
GTM1-DMFTC.zip ‏2 KB

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              Apple, Inc. Keyboard Hub
                        Apple, Inc Apple Keyboard
              Apple Inc. BRCM2046 Hub
                        Apple Inc. Bluetooth USB Host Controller
    FireWire Information:
    Thunderbolt Information:
              Apple Inc. thunderbolt_bus
    Kernel Extensions:
    Problem System Launch Daemons:
    Problem System Launch Agents:
    Launch Daemons:
              [loaded] com.adobe.fpsaud.plist
              [loaded] com.bombich.ccc.plist
              [loaded] com.Cvnt.Uninstall.plist
              [loaded] com.microsoft.office.licensing.helper.plist
    Launch Agents:
              [loaded] com.epson.eventmanager.agent.plist
    User Launch Agents:
              [loaded] com.adobe.ARM.[...].plist
              [loaded] com.adobe.ARM.[...].plist
              [failed] com.apple.MobileMeSyncClientAgent.plist
              [loaded] com.google.keystone.agent.plist
    User Login Items:
              AirPort Base Station Agent
              ZSyncDaemon
              Dropbox
    3rd Party Preference Panes:
              Flash Player
              MacFUSE
    Internet Plug-ins:
              AdobePDFViewer.plugin
              AdobePDFViewerNPAPI.plugin
              Default Browser.plugin
              DivXBrowserPlugin.plugin
              Flash Player.plugin
              FlashPlayer-10.6.plugin
              Flip4Mac WMV Plugin.plugin
              GarminGpsControl.plugin
              Google Earth Web Plug-in.plugin
              iPhotoPhotocast.plugin
              OfficeLiveBrowserPlugin.plugin
              Photo Center Plugin.plugin
              QuickTime Plugin.plugin
              SharePointBrowserPlugin.plugin
              Silverlight.plugin
    User Internet Plug-ins:
              CitrixOnlineWebDeploymentPlugin.plugin
              WebEx.plugin
    Bad Fonts:
              None
    Time Machine:
              Skip System Files: NO
              Mobile backups: OFF
              Auto backup: NO
              Volumes being backed up:
                        Macintosh HD: Disk size: 999.35 GB Disk used: 338.32 GB
              Destinations:
                        Data [Network] (Last used)
                        Total size: 497.96 GB
                        Total number of backups: 45
                        Oldest backup: 2013-03-30 05:21:00 +0000
                        Last backup: 2013-06-20 14:28:08 +0000
                        Size of backup disk: Too small
                                  Backup size 497.96 GB < (Disk used 338.32 GB X 3)
    Top Processes by CPU:
                   1%          WindowServer
                   1%          EtreCheck
                   1%          PluginProcess
                   0%          fontd
                   0%          EEventManager
                   0%          Dropbox
                   0%          com.apple.WebKit.Networking
                   0%          dpd
    Top Processes by Memory:
              2.36 GB            Safari
              418 MB             mds_stores
              307 MB             com.apple.WebKit.WebContent
              172 MB             com.apple.appkit.xpc.openAndSavePanelService
              147 MB             com.apple.IconServicesAgent
              135 MB             softwareupdated
              98 MB              Mail
              74 MB              Dropbox
              61 MB              PluginProcess
              61 MB              WindowServer
    Virtual Memory Statistics:
              3.06 GB            Free RAM
              5.53 GB            Active RAM
              2.14 GB            Inactive RAM
              1.27 GB            Wired RAM
              470 MB             Page-ins
              0 B                Page-outs

    I don't see anything obvious that would be causing your Mac slowdowns.
    You need to update all of your third party software if there are OS X Mavericks updates that can be applied. You may need to go the third party developers' websites if there are no updates through the Mac App Store.
    Update all of your Web browser Internet plugins, also.
    Also, if you have any third party devices, like keyboards, mice, drawing tablets, hubs, card  readers, etc, you need to update the drivers for these devices to OS X Mavericks compatible versions.
    Good Luck!

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