Summary:
Connecting large templates cause slowdown ?
Steps to reproduce:
I have to fairly large towers that when i build on just one of them no issues what so ever.
I then place a template of the tower , next to the other one. and then connect the 2 after it will take 2 secs to place a single block.
the example 
i made the left tower and wall without any issues then connect the 2 and now its impossible to build on really.
I tested it in a fresh save as well and there is a slowdown without a doubt. where the whole world stops but its not a lot in a fresh game.
Heres the template i used.building_templates.7z (20.8 KB)
Expected Results:
instant block placement
Actual Results:
Mini world stops on block placement
Notes:
Uploading save as well. it has usual startup errors. but it can be shown in a new game as well.
Attachments:
https://drive.google.com/open?id=0B7Sa8ogmH3qhVFVuQ0E2V1RCLTA
Version Number and Mods in use:
r19 v687
System Information: