Removes terrain decorations to reduce save file size.
Small changes concerning balance, gameplay, or graphics.
See this discussion on the Bottleneck mod page: https://mods.factorio.com/mods/trold/Bottleneck/discussion/2683
I've already solved it here: http://lappro.net/files/random/undecorator_1.0.3.zip
Thanks for the fix - I'll upload it as new version.