[MC-138496] Significant lag spikes when placing/breaking blocks.

When placing or breaking blocks in the world, significant lag spikes occur.

Environment

Windows 10 1809

Java 8 Update 171 x86_64

Thank you for your report!
However, this issue is a Duplicate of MC-137931.

If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.

Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki