[quote=@Sionnie]
I also though that they were use to speed up casting time by recording it as well as the conjuration or transmutation circle and that way a caster does not need to weave the signs or draw/summon a glyph or rune.. just a thought.[@VKAllen]
[/quote]

Most spells are cast within 1 action. Having a ritual in your spellbook doesn't mean that you cast that ritual faster, it just means that you don't have to [i]prepare[/i] it.