Function precompute_disclosures 

fn precompute_disclosures(
    sprequest: &ExtendedSessionRequest,
    creds: &Credentials<SigningKey>,
    total: usize,
) -> Vec<JWT>

Signs one disclosure per identity, in parallel across all cores. RSA signing dominates a single thread (it’s what made the load generator the bottleneck), so it happens here — up front and untimed — rather than inside the measured loop.