性能

1. Origins, structure, and basic meaning

• Structure: 性能 (せいのう) is the capability or quality with which a machine or tool performs. It appears in an overall comparison and a specific safety dimension.
• Basic usage: A new machine is compared with an older model; a buyer checks safety capability as well as price.

2. Common pitfalls and similar expressions

• Overall performance across models and safety-specific criterion
  • 機械の性能 is a broad set of capabilities, while 安全性能 narrows evaluation to safety. Price itself is not performance.