Running 8 gig memory but..only at 1066 speed. that could be it. Looks like another PC build soon
I don't think it has anything to do with your memory speed or that you have only 8 GB of memory.
The game doesn't need a lot of main memory. It's more GPU (graphic card) memory that is needed.
It also depends on when you have these short periods of "lags" or whatever you want to call them.
If it happens when you load a lot of images (e.g. before an animation is played), it could be your hard drive (in case the game is not on SSD, but still on a good old HDD).
If the game feels slow when changing from one location to another or when the calculations for the next day are done during the night, then it's probably the single core CPU performance that is the bottle neck.
Unfortunately, Python, as a very high level language that is interpreted, is between 10 to 100 times slower than e.g. C.
And all of Renpy and all my code is in Python.
On top of it, it doesn't support multi processor / parallel execution, at least not in any reasonable way inside Renpy.