Learn English – n alternative adjective to ‘written’ with an -al suffix

lucidity

n. the ability to see things clearly; rationality; sanity:

Perhaps deliberate:

adj.

1. carefully weighed or considered; studied; intentional.
2. characterized by deliberation or cautious consideration; careful or slow in deciding.
3. leisurely and steady in movement or action; slow and even; unhurried: moving with a deliberate step.

There's also the overused (in my opinion) Kafkaesque. It's close, although not exactly what you're after, since it usually implies a frustrating, perhaps unnecessary complexity as well, rather than an intentional well-behaved slowness:

adj.

2. marked by a senseless, disorienting, often menacing complexity.

I would go with deliberate, or a related word like careful, cautious, painstaking, etc.

There is also gradual, I suppose, although it feels strange to me here for reasons that I can't explain. You may have some success with it or one of its synonyms, though:

adj.

1. taking place, changing, moving, etc., by small degrees or little by little.

^{(All definitions from Dictionary.com)}