Most regions now run on YEngine, a script engine with better compliance of the LSL standard compared to the older XEngine. This means a set of new things to keep in mind. Specifically, memory management of YEngine is different and not as strict. As a result you will need to adjust scripts to make sure their memory footprint is properly managed. This information is available on the LSL Reference linked in our help section (http://wiki.secondlife.com/wiki/LSL_Portal ). If you follow the proper LSL standard and make sure to avoid some common mistakes, such as dividing by zero or mixing up integers with floats, YEngine will show great potential and efficiency over XEngine. If you need further help feel free to contact the grid staff.