PSX frame rate improvement in Windows 10

[Will]

I found a Windows display setting which dramatically improved my PSX frame rates, and I wanted to share in case anyone else finds this information helpful. (Note: I'm new to Windows.)

I recently bought a cheap Windows 10 computer and a generously sized 32" monitor (3840 x 2160 resolution). By the specs of the computer, PSX shouldn't have posed it much of a challenge, but I noticed that frame rates were in the 20's on landing, sometimes dipping into the teens, much worse than on the iMac I was moving from.

When I first set up the computer, Windows detected the resolution of the monitor and asked me if I wanted to display "text, apps, and other items" at 100% of actual size, 125%, or various other levels. I had picked 125% because it was the limit of what I could see comfortably; 100% made splash screens and in-app menus too small.

However, 150% was what was "recommended" by Windows.

So eventually I switched to 150% (under Windows Settings > System > Display). After doing that, I had to resize my browser, my PDF reader, Word, and just about everything else, and I had to resize the layouts I had made for PSX - the graphics were now all 150% larger and thus outside of the subframe dividers. But the result of this is that PSX now runs with frame rates in the 60s on the same situs that were giving me frame rates in the 20s and teens before. Problem solved! And PSX doesn't look any different; it's still rich and beautiful and without any perceptible change in display resolution.

[United744]

That setting is a scalar for fonts, mostly.

It shouldn't affect performance at all, so it suggests something is going on with the system or driver.

What graphics card and CPU does it have?

EDIT: I get 77 FPS no matter what (i7 9700K @ 4.8 GHz, GeForce 1080 @ 4K).

[Will]

That setting does have an effect on PSX graphics, and hence plausibly on performance as well. The range of choices goes from 100% to 350%. At each extreme, I can use the subframe +/- buttons to resize the ND in PSX until it measures 8" across on the monitor. At 100%, the lines on the ND are solid and crisp. at 350%, the lines on the ND start to look pixelated and choppy; in both cases the NS measures 8" across, so PSX is displaying the same amount of cockpit "real estate" in each case. It seems like the setting is affecting the number of pixels PSX gets per inch.

As for my cheap-ass, bottom-of-the-line system, I have:

i5-9400 @ 4.1GHz, cheap-ass Intel UHD Graphics 630.

I can switch back and forth between the 100% and the 150% setting and the frame rates on the Basic 024 - Landing situ jump between ~ 25 FPS at 100% and ~65 FPS at 150% or higher.