My machine has quad core i7 and should have enough ram. I tried different free Gerber viewers. They are slow to zoom or pan. There is always this "lag" feeling.
Does the gerber format contain too much data?
What do you use for Gerber viewing?
Electronic – Why Gerber Viewers are slow to display, zoom, and pan?
gerberpcb
Related Solutions
As long as they are visible in pcbnew (not hidden), they should show up in the gerbers.
Make sure you select front and back silk when plotting the gerbers. The output should be named $PROJECT.gto or .gbo, if i'm not mistaken. (gerber, top|bottom outline).
Normally the mid-layers in Altium are .G1, .G2, etc. Top and bottom layers are .GTL and .GBL respectively.
Possibly you're mistaking the G for a C, or possibly the program could be configured to use those extensions (though I don't think the version of Altium we're using has that capability).
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Best Answer
Gerber files aren't 'images'. They're manufacturing data that need to be rendered into an image each time. For complex PCBs, this can be slow. Things like polygons needs to be rendered. Smooth and rounded corners need to be rendered. Its sort of like taking a vector graphics image and then adding more metadata to it. Gerbv has an option for fast rendering which skips over the smoothening of edges stage. That should help with lag.
Some CAD software let you specify a fill size option for polygons. In eagle, its based on the line thickness you use to draw the polygon outline. The thinner this line is, the more complicated the polygon becomes and the longer it'll take the gerber to render. This happens because polygons are rendered line by line.