Affects Version/s: Minecraft 1.6.1, Minecraft 1.6.2
Fix Version/s: None
Environment:Windows Vista Business 86x
Intel Core Duo E7300
AMD Radeon HD 7750 Sapphire
Java version 7 Update 25
When a larger number of fences (normal or netherbrick) is present in a close proximity to the player interacting with blocks (placing, breaking, enchanting, renaming items,...) is almost impossible due to immense lag spikes (spikes are dependant on the number of fences of course) that occur.
Dev crash log:
I have also included a test world to demonstrate the bug.