Well... I think a lot depends on what you expect and what is acceptable to you.
Apart from that aspect you can't take much info from a statement that the game lags with a certain graphics card if you don't know what resolution and which graphics options were used. Does the game lag at some locations using for example 4k or 720p resolution. That's a big difference if you trying to get an idea if it runs at your own system.
I finished the game on a system that is even lower than jimrh69's system:
- Intel Core2Duo 2,66 Ghz
- 4 GB RAM
- AMD Radeon HD 5770 with 1 GB VRAM
- Windows 10 64 Bit
The game automatically uses the desktop resolution if you don't change the resolution in the game settings. That way the graphics stuttered heavily. So I set the game to 1280x720 and afterwards it worked well enough for me. But that means that I got about 25-30 FPS with only a few cases when the framerate drops below that value. That kind of resolution and framerate is not acceptable for a lot of people nowadays.
But I think it might give an idea on what kind of lower end systems the game runs with what kind of performance.
Fun fact:
I even installed the game on a really low end laptop (Windows 10 64 Bit):
AMD Turion 64 X2 TL-60 2,0 GHz / 2 GB RAM / AMD Radeon Mobility HD 2600 with 512 MB VRAM
I didn't expect that the game even starts... But it does. I changed the resolution to 640x480 (all other graphics quality options low or off). I played through the prologue, intro and complete chapter 1. The performance was horrible though. Loading times up to several minutes, stuttering graphics and audio nearly all the time. And some color glitches at scenes with certain lighting settings. But the game didn't crash.
