Polymarket: GET /book is ~50ms, POST /order is ~400ms. What's in the other 350?

Polymarket CLOB, from a VPS 7ms TCP away.

GET /book: ~50ms, consistent.

POST /order: 419ms median, 343-663 range, client caches pre-warmed (signing is 3ms), nothing else on the critical path.

So: is ~400ms normal for order entry on a venue like this, or am I on a slow

path? And is there a way to tell how much of it is matching vs just queueing

before the matcher? Best idea I have is timing a resting non-marketable order

to see when it shows up on the book, but that doesn't tell me anything about

a marketable one.