I have this same problem and I haven't figured out the best answer to it. I make knife scales in production quantities and G10 is always a problem. Part of my process is I use vacuum to hold a sheet down and I cut out the profiles of the scales on a CNC first. I always leave .015" skin at the bottom of the cut so I don't loose vacuum. So I like to cut them the rest of the way out on a scroll saw. But I face the exact same problem you're facing when processing G10. Blades last a long time in this application in wood or micarta, but G10 dulls them pretty quick. I can maybe get 20 or 40 inches out of a blade in G10. Fortunately, blades are pretty cheap.
To maximize blade life, slow it down if you can. Keep it wet. And most importantly, feed it hard. The harder you feed it, the less it "rubs". Rubbing dulls cutting tools, particularly in abrasive material. A coarse tooth count works best. I also like to use as much of the blade in the cut as possible.
I've been meaning to look into diamond coated scrollsaw blades for G10.