MK83,
Yes there a lot of threads about gameplay speed issues.
If you have to disable programs on a machine to get FPSC to run then that should not be so in as much as it should not be required as a pre - requisite for running any program.
Certainly FPSC can behave quite differently on individual users machines. You certainly need a fast machine to run it and one which well exceeds the mimimum recommended requirement is advised.
There are ways to boost performance and they will be found in the said threads.
"I am and forever will be your friend"