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HGCI (HYDRA Game Comfort Index)
🕑 Added 2025-09-10 16:04:00 +0000 UTCEver seen 120 FPS… yet the game still feels off? The motion isn’t quite fluid, aim feels a tad mushy, tiny hitches sneak in here and there.
That’s exactly what HGCI (HYDRA Game Comfort Index) is for. It isn’t “just another number”. HGCI tells you how good the game feels right now—and why: whether motion smoothness is slipping, input response is getting delayed, your FPS clashes with monitor/VRR behavior, the system’s running out of headroom, or your frame rate simply isn’t perceptually high enough.
We distill low‑level telemetry into a single 0–100 comfort score plus five clear components. You get a quick action map: what to turn off, what to dial in, where to cap FPS, whether to lean on VRR, and when to drop VSync. No smoke and mirrors—behind the scenes are real PresentMon signals (frame pacing, display latency, GPU/CPU queuing, flip delay, animation mismatch) and transparent rules you can inspect in the reason log.
Why it matters: average FPS glosses over the moments that break feel—uneven frame pacing, LFC traps in VRR, half‑rate VSync behavior, or hidden GPU queues. HGCI surfaces all of that live in HYDRA’s overlay and—crucially—tells you what to do next.
Who is it for?
Anyone who wants strafes on rails, crosshair that “sticks” exactly where you push it, and a camera that follows your hand without second‑guessing. From esports shooters to sim racing, HGCI shows the shortest path to “this feels perfect.”
What do Early Access Patrons get?
First hands‑on, evolving formulas, a transparent reason log, and a real say in what we improve next. In short, your honest tuning tool—fewer guesses, more confident steps toward a game that not only runs fast, but feels right.
Reading the overlay
The overlay shows six lines: overall score + label, then S, R, V, H, F (each 0–100). A brief “Warm‑up” may appear first while we collect enough live samples for a fair assessment. Labels range from Esports → Smooth → Playable → Compromise → Uncomfortable.
To earn Esports, you need more than a high total: S ≥ 90, R ≥ 100, V ≥ 100, and FPS must be at or above VRR‑min (or ≥ ~90% of your monitor Hz if VRR is off). No accidental badges — only truly elite conditions.
The five components (and what to do)
S — Smoothness. Captures 95th/99th percentiles, jitter, stdev, and AnimationError (animation out of sync with render). High S = fluid motion without micro‑stutter. Fix: stabilize frame pacing (cap into VRR range, reduce spiky effects/CPU load).
R — Response. Reflects end‑to‑end feel: uses DisplayLatency when available, adds GPU queue/FlipDelay, accounts for VSync/VRR mode, and even infers Frame Generation side‑effects when screen FPS overshoots present FPS. Fix: disable VSync, lock into VRR range (avoid LFC), trim heavy rendering, reconsider FG.
V — Display‑fit. Checks how your FPS matches monitor Hz: VRR in‑range, LFC risk, near‑cap behavior, density vs Hz, and tearing likelihood with VSync off. Fix: enable VRR, set a smart cap for your VRR window, or use VSync if needed.
H — Headroom. Your safety margin before hitching: looks at the tail (P99–P95), stability, GPU busy/wait balance, and queuing pressure. Fix: shave costly settings, balance CPU/GPU, smooth workload spikes.
F — Frame‑rate adequacy. A perceptual usefulness curve for FPS: 60 feels good, 90 feels great, 120–144 is near‑peak. Independent of Hz — it’s about what your eyes feel.
Total HGCI is a balanced blend — roughly S 25% + R 25% + V 20% + H 10% + F 20% — so cranking raw FPS without stability or display harmony won’t top the chart. That’s exactly how real comfort works.
Transparency: reason logging
For power users, HGCI can emit a reason NDJSON log: every score comes with the “why” — component breakdowns, VRR/VSync/LFC status, percentiles, jitter, GPU queuing and more. Great for comparing builds and sharing reproducible reports.
When?
The middle of next week.
Comments
Jesse Laroche
Wow, really? Do you have a source? Keen to understand what this means in practice.
mG_SIM
Question : is this based on Rivatuner ? I am asking because there is a problem on Ryzen CPU I hope you beware of with “GPU Power” read out in correlation with frametimes . Especially .1 and 0.1 frames are negatively affected when gpu power readout is enabled.
