What is PostScript primarily designed for?

PostScript is primarily designed as a page description language that allows for the precise representation of graphics and text in a way that is independent of the device being used to render it. This technology is essential for producing high-quality printed materials. It translates the visual elements of a document into a series of instructions that printer hardware can interpret, ensuring that what is displayed on the screen closely matches what is printed on paper. This ability to optimize graphics and text is central to PostScript's functionality, making it crucial in desktop publishing, graphic design, and printing industries.

The other options do not accurately describe PostScript's purpose. For instance, while chip performance optimization and measurement are relevant in computer technology, they do not pertain to the capabilities of PostScript. Likewise, the connection of circuit boards in mainframes involves a completely different realm of hardware engineering and does not relate to PostScript’s focus on document rendering and typography.