Piddy having watched your videos I noticed some tools you use lag on my machine and not on yours. Specs: d5400xs dual E5420 2.5ghz 4gb ram geforce 8800 gtx 768mb x-fi fatal1ty OS XP 64bit (load seems balanced between all cores but does not exceed 17% for some reason) Screen resolution is 1680 by 1050 and I am using two screens set as individual. I have not tried to change resolutions but I have tried to make the BTB window smaller. Tool tested was the blend terrain tool. Overall size in memory for BTB 438mb. Couple of my buddies experience even more delay and up to 100% of cpu usage. When I use the shift function with the blend tool the tool can not keep up with my cursor and uses 17% of processing power (again spreed between all cores) Advice welcome, when it comes to "finishing" touches increasing the speed of this tool to act as fast as it does in your videos would be a great help.