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One of our teams saw a significant (20%+) speedup on their product by switching to Amazon’s Cloudfront service. They’re using Paperclip and it only took about 20 minutes to switch from S3 to Cloudfront.
If you have an integer column in MySQL that does not allow NULL values and you update a row and set that column to NULL the column ends up being set to 0. This was very surprising to one of our teams.