There is no reason anymore to try to find tweaks over the internet.  What about their values?  For sure they are different from one PC to another.  If they work for someone, 99% will not work for you.

FSPS - FSX Booster has been designed keeping in mind the thousands of hardware available at the market.  It uses a very special way.  Analyzes your computer hardware in depth (CPU, GPU, Memory, Hard Disc speed and etc) and set all the important document and undocumented tweaks with the correct values that your PC needs to have with those tweaks.

No knowledge is needed. Just execute FSPS - FSX Booster, then FSX and enjoy it withthe maximum frames and smoothness you can get from your PC.

Latest version 3.7.0.0.

FlightSim Review

FSInsight Review

SimFlight Review

* Note: One licence per PC