Your song should be good when exported.
Here are some tips I can think of to optimize your project:
1. Reduce amount of insert effects, especially Reverb as an insert. Rather use 2-3 Reverb units (large, medium, small / room) as send effects and apply to the sounds needed.
2. Reducing polyphony on Thor can really save you some DSP.
3. Check the inside of Combinators for unnecessary devices, like dead devices or EQ / compression inside the Combinator, but also applied via the mixer too.
4. The general increase of your audio buffer and a higher CPU usage limit.
Hope that helps.
IchMensch on SoundCloud | Melopsyched
Studio One | Reason Essentials | Polar | Parsec | Antidote | Uhbik Studio Effects | ReelBus | Barricade | Variety of Sound