mkdir -p build && cd build
cmake ..
make -j8
ctest -j8   # run test
./cgol      # launch app

or

chmod +x build.sh
./build.sh

• Drawing is big bottle-neck for performance with large size of the board.
• Potential improvement could be - hand over rendering to separate thread.
• First time working with Qt. In the beginning i've selected to draw rectangles manually with painter, which I guess is not an optimal solution for rendering. QPixmap seems like appropriate thing to use here.
• Computing next generation of cells could be computed in parallel. E.g splitting game field into grid of 4 and launching a thread for each grid part.