Playing on a multiplayer 1.7.2 server, just today I have started experiencing cpu lag spikes 10-20 seconds after joining the server. I have updated java and graphics card drivers. I have narrowed the area down to a storage room. Anywhere outside of loading the storage room chunks is fine, CPU runs at about 50% of max. When the spike hits CPU runs up to 115%.There is no redstone, mobs, or item entities in the area.
Edit: Fixed. I started taking out chests until I took out a chest that had saplings, seeds, leaves in it and fixed the problem, an item in the chest must have been glitched.
Running on a MacBook Pro, OSX Mavericks (10.9)
2.3 GHz Intel Core i7
16GB 1600MHz DDR3 Ram
Nvidia GeForce GT 650M
Edit: Fixed. I started taking out chests until I took out a chest that had saplings, seeds, leaves in it and fixed the problem, an item in the chest must have been glitched.