mac powerbook 10.7.5, 2.2 intel core i7, 16 gb 1333 MHz ddr3, L2 Cache (per Core):256 KB, L3 Cache:6 MB, AMD Radeon HD 6750M

SweetHome3D-4.4 is what i downloaded and am using - no other plug-ins

i created the home, but everything suddendly slowed down, seems right after i added trees and bushes

i ...