Bonjour kidlat,
Do you wait very long to freeze the op stack? I found that it is good to freeze it when you have under 100 operations (move components + add vertex/edges, + others). In my case, I freeze everytime I can, especially when I added some polygons. This way my workflow keeps quite fluid (but not as fluid as it was in SI3D).
You can also try to work in Immediate mode. Click on Immed in the bottom of MCP. This freezes the operators as soon as they are created. Personally I don't use it, because it slows my workflow (everytime I do something I have to wait at least one or two second).
Hope this helps
Salutations - Cheers
Bernard Lebel