Mosaizer Lite is probably the fastest photo mosaic creation software in the world. It works completely in the system memory (RAM), including the picture library, and as a result your photo mosaic is created within a second or two. Or less: on an i5 machine it creates a 4 Megapixel mosaic within one second. It's based on the same famous Mosaizer Pro engine, so the quality is absolutely professional. But it's just faster. Much faster.