Well, if I start MoI from the Icon -without console- I get more or less the same delay.

It's like a quick hiccup. The delay just for don't feel comfortable.

I have just opened a 14 mb file, and I perceive a more delay.

Almost all, when I put the pointer over an object looking for its "object snap" and then when I rotate in 3d viewport.

About this, in small files it doesn't flow fine (there are small leaps) but in the 14 mb files, the rotate is unhandling (big leaps and I can't control the moment to stop the rotation)