I have build 126280 and have not experienced this bug.This 3 seconds lag with height brush is a bug which happens only in last update
As a test I converted my largest 10m Grid route to HD Grid. That task took several minutes. EDIT: The CM reports that the HD route is now 1693.4MB in size. The original was 284.8MB
I added a new blank baseboard at HD Grid resolution. I set the brush size to 0.5m and the sensitivity to 1% and started raising the ground height.
The response was what I would expect for a 1% sensitivity setting - there was an immediate change in the ground height but at a very low level (i.e. in how much the height increased). Increasing the sensitivity setting improved the level of response but in no case was there a noticeable time delay.
If there is a bug then its cause is not simply just the new update.
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