Review C++ code for potential optimizations

Hi. I have a 2D MMO game engine/server project written in C++ in 2012 with lua additions. I would like someone familiar with C++ to a very good degree to review the code or individual classes to potentially optimize the code and check if the memory is releasing correctly in the right places. With more players (60+) the process takes about 80% of the CPU resources and there are noticeable smoothness issues. I will provide all details and the project after showing willingness to accept the assignment.