I am relatively inexperienced at preparing large poster sized documents (e.g. 100cm x 220cm) containing detailed photographic images, for high quality printing. I find that every change takes forever to save. My PC is not a slouch -i7 processor and 16GB RAM. 1TB Disk with OS on 250MB solid state. Because the quality of the photographic image is important the document is sized at 300dpi.
Is there a sensible way to approach this task that does not make it so tediously slow?