Instructions
Visit the website of your graphics card's manufacturer. Download and install the latest drivers for your card. Graphics card manufacturers regularly release driver updates, which can improve in-game video performance.
Close any running applications before launching "Flight Simulator X." Every application that is running on your computer consumes both processing power and random access memory, therefore reducing the resources available to "Flight Simulator X," which can cause lagging or freezes.
Launch "Flight Simulator X," and click on "Settings" in the left-hand pane. Drag the sliders to the right next to the items whose quality you wish to improve. For example, to improve the graphics quality of your aircraft, move the slider next to it to the right.