The dyslexia point is interesting; yes, English orthography causes more reading disorders than languages with more regular spelling-to-sound mappings (Italian, Finnish, etc.). That's consistent with the parser having to work harder when the signal is noisier.

Your intuition about "slower more intentional parsing" connects to something I'm exploring: we may parse language at two levels simultaneously; a fast, nearly autonomic level (think: how insults land before you consciously process them) and a slower deliberate level. Whether those levels interact differently across languages is an open question.