My first bug post, apols if its a duplicate.

To re-create:

1 - zoom right in then zoom right out, repeat. Memory usage slowly increases (in small chunks usually less than 10K). Usage goes up and down, but trends upwards

2 - it appears that the steps are much much larger if zooming right after moving a character. It is possible to see the mem usage just go up and up every second with no further interaction. These increases vary greatly in size but can be 100s of K

2.1 - its possible to stop this ever increasing mem useage by moving a character. After 5 or so seconds the useage will flatten

2.2 - moving the focus from the game to another application and then moving the focus back tends to stop the increases. Behavior revert back as described in point1 above, except big zoom operations will typically increase usage by larger amounts than before

 This happens when running in windowed mode.