The more models there
(Sketchup.active_model.entities) are, the more time it takes to interleave the two models
When there are two groups in the model, This method
g1.trim(g2) takes 0.1s.
When there are two thousand groups, This method
g1.trim(g2) takes 100s.
(g1、g2) is always the same two groups, only the total amount of models in the model is different