No there is no special ticket for memory issue in snappy, but there are some others
https://senbox.atlassian.net/browse/SNAP-869
https://senbox.atlassian.net/browse/SITBX-562
https://senbox.atlassian.net/browse/SITBX-482
I’ve created one now. (SNAP-960). For me it is not yet clear where the memory issues comes from. Maybe it is within SNAP, maybe in jpy or in snappy. This needs to be investigated.
However, I can tell that the further development of SNAP and the Toolboxes will start again soon. And then we will tackle such memory and performance issues. Finally… 
But till the fixes will be released it still might take a few month.