Sorry that I don't have enough reputation to post images.
The main problem is that it tells me that I need to install a C compiler and reinstall gensim or the train will be slow, and in fact it is really slow.
I have installed mingw32, Visual Studio 2008, and have added the mingw32 environment variable to my path.
Any ideas on how to solve it?
When I installed it from conda-forge then I obtained a version that is already compiled and fast:
conda install -c conda-forge gensim
Gensim needs a C compiler?