Does a Google Datastore query plus transaction run slower than just a query?

Question

Are Google Datastore queries slower when put into a transaction? Assuming the query is exactly the same, would the run time of a transaction + query be slower than the query not in a transaction?

Does the setup of the transaction add any execution time?

Answer 1

Here's some data from running a single document get 100 times sequentially.

type	avg	p99
transactional	46ms	86ms
nontransactional	16ms	27ms