I need help to decide whether I should convert my project to C++ and how to do it easier

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Have a look, lots of reading here:

FAQ: Debugging, Optimization, and Profiling

FAQ includes content originally written for UDN. What is generally considered too much for mobile devices in terms of texel density and draw calls, and what are the best techniques for optimizing “high detail” content for slower devices? We tend to start with high detail, and remove it later, by turning things up rather than down Where possible, it is beneficial to run the same test consistently (ex replays), or an equivalent repeatable setup This is an area where Apple devices tend to be mor…