The posts are text only so the memory usage doesn't grow very fast. You can post images using Markdown but the images themselves have to be hosted elsewhere. I've created a few million posts on a development laptop and the memory usage was not bad (can't remember the exact number).
Right now there is no memory limit or handling for when memory reaches a certain point. Pruning based on FIFO or fewest replies could work, or OS level techniques to handle memory limitations like swap.
I will add some screenshots to the repo. Thanks for the suggestion.
