Sector began with my desire to give every investor access to a low-cost, diversified portfolio that’s precisely tailored to their specific economic and moral preferences. Existing solutions made it possible to get two out of three attributes: low-cost, diversified, or personalized, but hitting all three was usually impossible.
EBS volumes (Amazon's equivalent to a SAN as a Service) have different performance characteristics before and after their first reads and writes. The read side variability is particularly strong on the first read of volumes that were restored from a snapshot. This makes a lot of sense when you realize that the snapshots are stored in S3 behind the scenes, and are lazy-loaded on first read.