Bug: Performance: Identity Creation is 3x slower than V3

[api-Hypernova]

Describe the bug

"Identity creation" operations which involve the node are three times slower on D14N than the old centralized infrastructure.

Reference interactive model

Expected behavior

We must decide if this is an acceptable degradation given architecture differences between V3 and V4.

Steps to reproduce the bug

The slowdown can be reproduced by generating a single identity with xdbg:

Baseline: cargo xdbg -d -b staging generate --entity identity --amount 1 --concurrency 1

New: cargo xdbg -b staging generate --entity identity --amount 1 --concurrency 1