What about following proposal: coreboot is an extended firmware platform that delivers a lightning fast and secure boot experience on modern computers and embedded systems. As an Open Source project it aims to provide auditability and maximum control over technology; On some platforms (especially non-open ISA platforms), some boot functionalities are provided by Silicon Vendor binary blobs.
This is too wordy and full of jargon, and confuses goals.
it was never about the speed. The speed was a nice side effect, but ti was really about the openness. Once you start talking about speed you lose the thread -- we had this problem all the time in 2000: vendors got focused on fast and missed the main point, that we wanted control.
Remember that many people come to coreboot thinking they're going to load a usb stick up and install it somehow. Few people have any clue what's going on here.
You need fewer adjectives, and simpler words.