That looks pretty dense to me...Also, the shelving material I placed on the screen is porous, but not as porous as the screen itself so that may be slowing it down some as well.
http://www.amazon.com/Duck-855145-Non-Adhesive-12-Inch-20-Feet/dp/B0027P9516/ref=zg_bs_3744211_3

That looks pretty porous to me...Yes that might be slowing it down a little. I use this one, slightly different and is more porous.
http://www.amazon.com/Duck-1344559-...201_img_3?ie=UTF8&refRID=025ZA4NPWNCV6QQSV47E

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