Hi Sarah, You just made me feel so much better about my own impatience when building overviews. But my computer has been running for 25 hours not days! I am building overviews for a mosaic dataset of about 4000 images (jp2s) which range up to 20 Mb each. Did you find an answer to your question about how to make it run faster? I only have 4 GB of RAM. Very interested, Theresa
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