[Runtime Bug]: Something about DLFG feels off

Describe the bug

With more recent remix updates, me and other people noticed that having an FG multiplier larger than 2x feels somewhat off. I have Intel Presentmon running to see if FG is actually producing frames. I have a 120hz display.

Eg. in GTA4 with a baseline framerate of ~30fps (cpu limited) - no framerate cap in the game nor via nvidia app or dxvk.conf - no vsync - no gsync or freesync active

• No FG: choppy - 27fps (intel)
• FG 2x: pretty smooth - 56fps (intel)
• FG 3x: still smooth but a little stuttery - 81fps (intel)
• FG 4x: still smooth but even more stuttery / feeling off - 96fps (intel)
• FG 6x: almost no smoothing - almost feels like no FG but with added delay - 146fps (intel)

Baseline framerate of 60fps still slightly cpu bottlenecked:

• FG 2x: very, very smooth - 100fps (intel)
• FG 3x: very, very smooth
• FG 4x: very, very smooth
• FG 5x: less smooth, a little choppy
• FG 6x: still feels like no FG - much worse than 2x - 240fps (intel)

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Using throttle presents in the remix dev tab - set to 40ms (same game scene as above which would be at 60fps):

• 2x: much better than no FG
• 4x: I think I can "see" more frames but it feels a lot less smooth than 2x?
• 6x: still better than no FG but worse than 4x and much more worse than 2x

Would love to present some footage but its almost impossible to record / see on footage.

I'd say its only really noticeable with a base framerate of 60 or below. Noticed it in GTA4, Portal 2 and Left 4 Dead 2.
Others also reported weird frametime feeling with FG above 2x. I think 4x FG was fine for me at one point but I'm not totally sure about that.

CR (from the discord community) said he has seen it on:
Skate 3, Garry's Mod RTX, UnityRTX, and BetaRT

How do you reproduce the bug?

Switch between FG modes with a base framerate of around 30 to 60

What is the expected behavior?

No response

Version

Build 1319 (latest actions build)

Logs

No response

Crash dumps

No response

Media

No response

Start by reproducing the issue in build 1319 with a 30–60 FPS base rate, switching between 2x, 4x, and 6x FG in GTA4, Portal 2, or Left 4 Dead 2. Use Intel PresentMon and the Remix dev-tab present throttle to compare frame pacing and perceived smoothness. Done means the higher-multiplier behavior is explained and corrected or narrowed to a documented, reproducible runtime issue.