Here is the test results. In order to prevent a small pun, I will mess up the order.
Test Results
Append Assign Extract Purge 2.5 m / s 24.2 / s 1.03K 39.15 / s 1.9m / s 17.7 / s 0.59k / s 293.25 / s 8.3m / s 71.3 / s 1.03k / s 525.55 / s
Where 1m / s means that 1 million function calls 1k / s indicate 1,000 times 1 / s per second once a second per second.
You can test it on your machine, you know why I cheer for Andrew.