I don't think its the trainer. Try doing what your doing without the trainer running. If your computer takes a long time to load into, it might just be your computer.
I have a high end PC(Top of the range cant even upgrade anymore to get any more FPS) and I have no issues.
My friend has a similar issue, he is using pretty bad laptop and it takes him about 10 minutes to get in game. After about 15 minutes of doing a lot of GPU and CPU heavy things in game like shooting blowing up things his game crashes, sometimes even his PC.