A bulk of speedup is an item in Evony TKR (The King's Return). It can be found after killing certain monsters or bosses, with some of them listed below.
The description of Bulk of Speedup in Evony TKR says:
Bulk of Speedup is known to drop from a number of bosses or monsters upon killing, including Medium Cerberus.
Note: This list may be incomplete.
Bulk of Speedup opens up to all of the following items: