Hey @Evgeny. Great to hear you looking into using Ceramic! I will answer points 2 and 3 and will tag @dbcfd to jump in on the first one.
We don’t have an exact number on this yet (should be able to provide these benchmarks soon), but a Ceramic node uses a Postgres DB for indexing so data access speeds should be pretty fast depending on the use case.
We haven’t implemented native privacy yet - whether TEE or ZK. I am curious to hear more about your use case and the need for TEE specifically.