There have been a few cases reported by customers that using --watch has been on the slow side. We should elicit feedback to understand what's going on.

Examples:

• https://www.reddit.com/r/typescript/comments/48rzzq/protip_what_to_do_to_solve_the_current_slowness/
• https://gitter.im/Microsoft/TypeScript?at=56d86d9906ba9a282a28ecf1