Quick answer: Click-to-photon (also called latency-to-photon or end-to-end latency) is the full delay from your click/stick move until the matching pixels light on the display. It is broader than casual “input lag” talk — it includes USB polling, game/engine work, render queue, scan-out, and panel response.
You will see click-to-photon in competitive monitor reviews, NVIDIA Reflex latency analyzers, and esports peripheral marketing. Product pages often quote only one slice (display lag, or “system latency”) and imply the whole path.
This explainer is based on how latency tools and vendors describe end-to-end delay. Gadget Clash does not run analyzer benches. Treat published ms figures as directional for that test rig.
Click-to-photon at a glance
| Question | Short answer |
|---|---|
| What it is | Full path delay: input → PC/console → pixels on screen |
| Not the same as | Average FPS alone, or a single “1 ms GtG” panel claim |
| Care most if | Competitive shooters, fighting games, aim feel training |
| Ignore if | Casual single-player where comfort and image quality win |
| Related | Input lag, NVIDIA Reflex, controller polling |
What click-to-photon actually is
A useful mental model: peripheral latency (mouse/controller USB rate) + PC/console latency (simulation, CPU, render queue, GPU) + display latency (scan-out, processing, pixel response). Click-to-photon tools try to measure from a button event to a brightness change on the panel.
Raising FPS usually shrinks frame time and can cut queueing — but frame generation can raise FPS while adding latency. That is why Reflex-style “system latency” marketing and click-to-photon tests matter more than FPS alone for competitive feel. See also Hz vs FPS: a 360 Hz panel cannot show frames you never produced, and a low-Hz panel caps how soon a finished frame can appear.
Why it shows up on product pages
- Esports monitors: “lowest lag” claims next to GtG numbers
- GPU features: Reflex / Anti-Lag sold as latency reducers, not FPS boosters
- Mice & pads: High polling rates marketed as click-to-photon helpers
- Review charts: Analyzer bars comparing Game Mode On vs Off
Buyer takeaway: Chase the whole path — Game Mode, high FPS, Reflex when supported, sensible peripheral rates — not one marketing millisecond.
Choose it if / Skip it if
Obsess over click-to-photon if you play ranked aim-heavy games and can feel delay. De-prioritize it if you mainly play story/RPG titles, stream at capped FPS, or already run Game Mode + VRR happily.
Latency slices vs related terms
| Term | Slice of the path |
|---|---|
| Click-to-photon | End-to-end: input event → visible photon |
| Input lag (casual) | Often means “feels delayed” — sometimes only the display |
| NVIDIA Reflex | Cuts render-queue latency in supported PC titles |
| Controller polling | How often the pad reports — one early slice |
Practical checklist
- Enable TV/monitor Game Mode; disable unnecessary post-processing
- Raise stable FPS; prefer Reflex / low-latency modes over FG for compete
- Use exclusive/fullscreen paths when they still help on your OS
- Reasonable mouse/controller polling — see polling rate
- Keep VRR on when it reduces tear without weird lag spikes
Frequently asked questions
Is lower click-to-photon always better?
Diminishing returns kick in hard. Going from sluggish TV cinema mode to Game Mode is huge; shaving 0.5 ms off a mouse may be placebo.
Does 1 ms GtG equal 1 ms click-to-photon?
No. GtG is pixel transition time — one display slice, not the full path.
Can cloud gaming match local click-to-photon?
Rarely for competitive play — network RTT sits in the middle of the path. See cloud gaming.
Does VSync hurt click-to-photon?
Classic VSync often adds delay. Prefer VRR when available.
Related terms
- Input lag · NVIDIA Reflex
- FPS · Frame time · Hz vs FPS
- Controller polling rate · VSync
- Gaming Knowledge Base
Editorial note: Analyzer methodologies differ. Compare like-for-like tests, not marketing ms across brands. Part of the Gadget Clash Knowledge Base (Gaming).