The Q4XP is our most ambitious endeavor, far surpassing our previous aircraft releases in both art and code. Visually the Q4XP has 3 times the art assets as the 732 TwinJet. That said, we incorporated some performance optimization to make the experience upfront and facing forward the best it can be even for those on older hardware.

We want you to get the most out of the product, so we feel letting you in on how it works under the hood is important.

Object culling

• The Q4XP culls objects that you won't need if you are just looking forward and/or for a few other reasons with the goal to free up your vram to be used for scenery and other things.
• The Cabin will be culled while you are in the cockpit looking forward, or if you are inside the cockpit with the cockpit door closed.
• The Exterior will be culled while you are in an internal view looking forward.
• The Cargo bays are culled any time no cargo doors are open.
• The Cabin fluorescent lighting spill lights will be culled when the sun is above 10 degrees to the horizon.

This may look funny, however, this is what it would look like if you could see what is being culled while you look forward only. This frees up roughly 2/3 of your VRAM to be used for other things. The moment you change your view to an external view the rest of the plane comes back.

With the sun 10 degrees or more above the horizon, the fluorescent light spills are culled to improve fps, this is what it will look like.

This is what the spill lights look like when they are there.

When it comes to performance and FPS, a lot of factors are at play, such as your hardware, scenery, and your preference for an fps number. We hope this info helps you get the most out of the Q4XP, however, everyone's situation is different.

Quick tips

• Close the cockpit door in flight so that the cabin will not be rendered.
• Prevent fps loss from cabin lighting objects, fly during the day only, not dawn, dusk, or night.
• Try using OpenGL if Vulkan is giving you issues.
• Try reducing the x-plane texture resolution slider.