do you have the same problem if you start a new game or only on loading the old one?
Well, maybe Stardock will figure out some general optimization for AMD that would help alleviate the problem you are experiencing.
This isn't an AMD issue, this is a 1.7 issue with saved games. If you saw the video you'd understand, if you'd like I can PM it to you later so you can see what I'm referring to and what is actually going on with saved games on larger maps.
Issue is not present with early new game start in 1.7 but, I haven't played that game for more than an hour or two. The games I play normally last 50+ hours to get to the point in the game where I'm at in my saved games. Realize in the video I included I was around the 38 hour mark with around 50+ star bases all at different points of completion compared to what modules are available and only about 10 ship yards to support them.
Now imagine all of the star bases all adding all available modules to each shipyard all during the turn process. This creates one of the issues. To prevent this you could go through and turn the auto upgrade star base to off and that will prevent this happening during the turn process but, then the player has to go through all 50+ star bases currently to do this.
Now that one has done that, now imagine going through and if you choose manually adding 3+ constructor requests for each star base. (To prevent 10-20 being added to most with auto upgrade, I only want to add a few modules the rest I could care less about.) This too starts causing huge lag in the game with going to other star bases or even planets and trying to destroy/build buildings ect...
All of the above is in that video and is not an AMD issue, that is what I was talking about and, is completely different than the normal turn time delay as the game goes on and how it may vary from processor to processor. Thank you for the suggestions though.