Hi. When I played though the tutorial today, for the first time in a
long time, the experience at the start was quite nice, but after a while
the game became slower and slower. A look at 'top' showed that the
program was using a lot of memory (31% of my total), and all swap was
spent. At the end it was running so slow it was hard to use the game.
After I ended the game I did a test run in valgrind just starting and
stopping the game (ie just visiting the main meny), and according to
valgrind 200 MiB was lost and 400 MiB was indirectly lost. In addition
there were heaps of problems reported by valgrind about use after free.
I asked about excessive memory usage on #unknown-horizons
(irc.freenode.net), and was told by user LinuxDonald that several fixes
regarding memory usage should be fixed in version 2017.2. Perhaps some
of these fixes should be backported to Stretch?