#N/A Is Omitted (replaced With A Blank Cell)

How I might be able to streamline the following formula so that the #N/A is omitted (replaced with a blank cell) but there isn't quite as much of a time lag?

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=IF(ISNA(VLOOKUP(D3,'C:Documents and SettingsMeDesktopQuick Computer Jump Spreadsheet[Quick Computer Jump.xls]PCs'!$F$12:$P$234,11,FALSE)),"",(VLOOKUP(D3,'C:Documents and SettingsMeDesktopQuick Computer Jump Spreadsheet[Quick Computer Jump.xls]PCs'!$F$12:$P$234,11,FALSE)))

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Here is the background information for what I am looking to achieve:

I have two spreadsheets I am working with. The first spreadsheet, the "What Computer has User Logged Onto Log" spreadhseet, dynamically imputs and displays data from the log file of a logon script: the date (column B), time (column C), computer name (column D), username (column E) and IP address (column F). The second spreadsheet, the "Quick Computer Jump Spreadsheet", has many pieces of information (including the computer name (column F) and computer description/room number (column P) -- which are the two important pieces of information there).

Yesterday I found a tip that allows for VLOOKUP via two different spreadsheets. Specifically to have the computer description/room number column (P) information from the "Quick Computer Jump Spreadsheet" filled in as column G in the "What Computer has User Logged Onto Log" spreadsheet. It was this formula here: =VLOOKUP(D3,'C:Documents and SettingsMeDesktopQuick Computer Jump Spreadsheet[Quick Computer Jump.xls]PCs'!$F$12:$P$234,11,FALSE)

This was great because it meant not having to copy and paste the computer description and room number information into the spreadsheet I want to apply the VLOOKUP to and means I don't have to maintain and update the computer description and room number information in multiple locations, whenever that information changes. This formula worked beautifully, seems to be every bit as quick (with no visible lag) as when calling for the information from inside the same spreadsheet. In the case of dynamic data I could even use the Fill Formula all the way down to the bottom of the spreadsheet so that as other fields were filled, so was the computer description and room column. In short, it pretty much did everything I wanted it to

The next challenge I set for myself then was to see if I could get rid of the annoying #N/A when data wasn't found by the VLOOKUP function. Especially in those cases where I filled down below the last row in my spreadsheet in order to have the computer description/room number information automatically filled in as the other columns (A-F) are filled in.

I did some additional research and found this tip (here: http://www.mrexcel.com/archive2/47600/55248.htm). Using this information I was able to revise my original formula so that it now looks like this:

=IF(ISNA(VLOOKUP(D3,'C:Documents and SettingsMeDesktopQuick Computer Jump Spreadsheet[Quick Computer Jump.xls]PCs'!$F$12:$P$234,11,FALSE)),"",(VLOOKUP(D3,'C:Documents and SettingsMeDesktopQuick Computer Jump Spreadsheet[Quick Computer Jump.xls]PCs'!$F$12:$P$234,11,FALSE)))

This works but is unfortunately much slower than the first (I presume because of the double VLOOKUP required in order to compare and then execute?). Up to 30 to 45 second delays when the "What Computer has User Logged Onto Log" spreadsheet is refreshed.

I found the webpage info, here: http://www.mrexcel.com/td0110.html that had the following alternative ways to write the above formula that don't require the double lookup, thus making them much faster and more efficient to use. The problem here is the examples given are for absolute searches instead of non-absolute like my formula above and I have been unable to figure out how (or if) I can adapt any of these solutions to my own.

Does anybody know of any other way I might be able to write my formula above, to receive the same result, without having to do the double lookup, and thus decreasing the 30-45 second delay every time the spreadsheet goes out to update the computer description and room number information?