Accessing Document Properties needs long

Hello.

I wrote a Excel Macro which writes Names of Files from a SharePoint Library in an Excel Sheet.
Also some of the Document Properties are written in the sheet, but reading them needs quite a long time, so the macro is working for 15 minutes or so if the library consists of 200 files.
The code where i read the properties is as follows:

Please Login or Register  to view this content.

I figured out that the line "Set objFile = GetObject(strFilename)" is the one who needs this long time to execute.
Is there a possibility to get this running faster?
Thanks for any suggestions.

I figured out, that i can, for example, access the DateLastModified quite easily without opening the file.
But it seems, this is not working with the Document Properties. Is there another way to get the properties instead of making an new object of the file with GetObject?