Efficiency 4 on shovels should insta-mine, and did before the 14w32a snapshot. After testing I found that efficiency doesn't effect dig speed at all on shovels. This bug was not resolved in 14w33a.
MC-67371
Efficiency on Shovels and Axes not working
Resolved
Duplicate
0
Kieran O'Reilly
(Unassigned)
Unconfirmed
Minecraft 14w33a
Retrieved
dupe