I got this back in winter but I can't enjoy it.  The airport looks great but I'm getting bad performance.

Taxiing or flying around the airport gives me serious fps hiccups.  On average, every 5 seconds or so, the fps would drop for a split second.  It happens when I taxi or fly around the airport, especially when the airport comes into view.  It's really annoying.

 

It happens on Aerosoft Rome as well when I'm flying over the airport.

 

I know it's not my PC or anything because I have other sceneries that are much more complex and they run silky smooth.

Maurice you might choose to read the (long) Sticky thread at the head of this forum.

Will do.  Thanks.

I got the tool and scanned the scenery.  There are a lot of files with missing alpha channels. 

But I don't know what I'm suppose to do next. 

First I highlighted the file from the list.  When I click Open/Next, Windows Photo Viewer opens up but nothing showing.  Just a message telling me that WPV doesn't recognize the file or WPV may not be up to date and can't open it. 

It seems I'm getting a different result by clicking Open/Next than what Ian described on his post.  Any help?