VBA Delete Multiple Worksheets

I have a workbook that users add sheets to, and save and the workbook just get's junked up. I know you can use VBA to delete a sheet, just by simply executing

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But that is slow! What I am after is to delete ANY sheet that is not named "Master Data" or "Holding Pattern" in the workbook.

Not sure if this will provide any speed increase or not, but the syntax I always use to exclude a worksheet or two when needing to delete is

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I think the sluggishness comes into play when your workbook has a large number of sheets in it, as this syntax above iterates over each worksheet individually.