Earlier quoted context omitted.
In print? In general its faster to write and a lot easier to read, also you save time by not having to learn two different systems.
It's definitely not faster to write. That's kind of the whole point. Also it's barely a "different" system. You just join the letters together. In the UK it's called "joined-up writing" and everyone learns it in primary school where there is plenty of time for learning. It is definitely easier to read print though - for a lot of people's handwriting anyway. It's much easier to be lazy and just do an illegible scrawl…
Mostly though, speed comes with practice. If you only write in cursive, you'll no doubt feel manuscript writing slow. I only use manuscript writing and find cursive painfully slow.