Hey there, I had a few simple ideas that could help with game improvement.

1- Add a "Game Suggestions" button on the home screen when first launching Factorio.
(I hardly ever use forums, and I was looking for a place to write a recommendation while playing the game.)

2- Add an "Instant Play ...

I am having the exact same issue now that I have updated to .15x. In the previous version, .14, I had no lag/frame rate issues, and I had the ability to run around my megabase with ease.