Sympatric speciation, where new species evolve in the same location, is still debated in science. If it's rare, most populations don't meet the conditions for it. This study looked at two key factors: how easily individuals choose similar mates, and if females are punished for this. Simulations show that sympatric speciation can be very slow if these factors are limited. The quick evolution often linked to sympatric speciation might only happen in specific situations.