[extrapickles]

Completely different. This is all about how the system handles a read/writing.

The original behavior was the OS/Hardware would tell your program it has data ready (hardware limited to hundreds of times/sec). This was changed to your program showing up occasionally with a large truck to load data (basically cpu limited).

The old way was perfectly fine for mechanical hard disks, but with SSDs they were running into limitations with how often you can process interrupts (think of them as a hardware level context switch, very expensive).