We’re (largely) not running OSes from spinning metal anymore, so even if there were some I/O that needs to happen (there shouldn’t be), a second would be an indication that the app was doing it badly. A modern SSD will read multiple gigabytes in a second, if the reads are sequential and you don’t wait for each one to complete before starting another. Unfortunately, we as a species have not figured out the programming tools necessary to make that natural.