The client who didn't notice a difference would probably call it a bugfix.
The client whose software got ever-so-slightly more reliable probably would call it a minor update.
The client whose software previously was loading large files (luckily) without issue would call it major, because now their software just doesn't work anymore.
The client who didn't notice a difference would probably call it a bugfix.
The client whose software got ever-so-slightly more reliable probably would call it a minor update.
The client whose software previously was loading large files (luckily) without issue would call it major, because now their software just doesn't work anymore.