Accounts with too many objects can reach rpc rate limit

[Tzal3x]

Reaching this rate limit results to failed transactions with a socket hang up error.

How many objects are "too many" depends on the rpc rate limit, but as a rule of thumb let's say anything greater than 500.

To resolve this we could either increase the amount of objects that are fetched lazily into the mainPool or load all the objects at once instead of batches.