Why play a old games in 2026 with G3D so laggy

[yanghanwen]

I tried F.E.A.R andAssassin’s Creed IV: Black Flag in G3D ,it’s FANTASTIC and …………lag.
Resolution setting is 2560*1440.
My sustem is I9 13900HX + 4060 8g +48GDDR5*2,why play a 2005 game in 2026 so lag?
Why is my computer so laggy when playing F.E.A.R. and Assassin’s Creed IV: Black Flag with G3D in 2026?
Is something wrong with my vorpX settings?
And I want to play killing floor1\Prince of Persia: Warrior Within\Resident Evil 5 in G3D?Seems VROPX doesn’t support this?

[fubar]

Probably cause you have a very low end GPU. In G3D everything needs to be rendered twice and there are probably some additional inefficiencies so even an old game at low resolution is probably too much. I might be wrong though and there could be some additional problem.

[Boblekobold]

Yes, G3D is demanding.

But old games run well in my experience.

I was able to play Bioshock Infinite and Bioshock 1 with G3D and 3840×2880 resolution with a 13 years old CPU and a GTX1080 but :
– it was a Desktop GTX1080 (it matters a lot)
– I used a Reverb G2 + WMR/OpenXR (Quest 3, for example, is more demanding -because of Oculus I guess- for a worse result -because of compression-, and since you have a 8Gb card, you may lack VRAM with this kind of VR headset)

It was smooth, but I probably didn’t have a very high framerate (I didn’t noticed it and it didn’t bothered me but I guess it wasn’t 90fps at all).

Even if a game is old, it can be beautiful but a bit demanding with G3D (even if old DX9 games are usually very efficient compared to recent ones, which means thay with a good graphic card they run very very well and can still be particularly impressive in high resolution with enhancements filters and full VR G3D, sometimes 6dof).

You can try to use the Judder Protect option (or other sync options), or to cap the framerate (VorpX’s ingame menu). Sometimes it’s just some kind of sync problem.

I also had a problem with Windows power options, which were limiting the hardware.

[Laser]

G3D can be very demanding, also 4060 with only 8 gigabytes is rough in 2026, next time buy something with decent amount of memory. I don´t know what headset you use but if you are running higher framerates consider dropping down a notch. Even with my 5090 I many times switch to 72fps mode instead of 90. I recently tried black flag and it was heavy to run, if I remember correctly I could not use 3840×2160 without dropping below 90fps. Older games won´t necessarily scale well with newer hardware. Original F.E.A.R should run decently with even mid spec computer.

Also make sure that you aren´t running vsynced to 60fps. Atleast with Assassins Creed you need to run the 240fps patch to unlock framerates if I remember correctly.

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