BuildCraft version: 7.99.14
Forge version: 14.23.3.2655
Link to crash report or log:
Singleplayer or multiplayer: Singleplayer
Steps to reproduce:
Additional information:

Everything is fine until miner hit bedrock and stops. The game then lag severely until miner block is broken
Turning power off has no effect on removing lag
Removed Bedrock flattening mod to see if that was affecting it, no change