Do I write too slowly?

Apologies if this post turns into a self indulgent rant. I'm going to try to make sure it doesn't, but I might not succeed. You have been warned!Anyway, I've been thinking about this for a long time and seeing something on Facebook tipped me over in to writing about it: do I write too slowly?There was a comment on Facebook about why people choose to write independently, versus signing up with a publisher.