Update wholesale price on product

[Erik-Dev]

Hi,

What is the correct way to update a few fields on a product through the api? 

1. Get the product, change the deltas and update the whole product with all fields provided in PUT

2. Get the product, compare, and create a new PUT product containing only required and delta fields?

3. ???

The problem im noticing is a very slow process when updating the product with all fields (1.), up to 20 seconds for one product, and i need to update a couple of thousand.