Compare frame rates at one speed.
Choose three rates. Follow one marker with your eyes.
Paused. All lanes move at the same speed. You choose when motion starts.
Requested is the target rate for each lane. Observed counts its position updates per second. Every lane is limited by the browser’s animation cadence; some requested rates can produce uneven steps.
Use the moving markers to compare how often their positions update. Each row travels at the same speed in pixels per second. A lower requested rate produces larger steps; a higher one requests smaller, more frequent steps.
Choose one thing to compare
Start with the default speed and watch one marker as it crosses the page. Then compare two rows. Change the speed only after you have a feel for the first pair; changing both speed and frame rate makes the difference harder to interpret.
The labels show requested update rates; the observed reading shows what each lane achieves. A browser providing around 60 callbacks per second gives every lane at most 60 position updates, so requested rates of 120 and 240 may look alike. Rates that fit unevenly into that cadence can also produce uneven steps.
Read requested and observed rates together
The selected rate controls the animation’s position steps. The observed rate counts the updates this page actually schedules within the browser’s available callbacks. Try the browser FPS test to see this page’s available timing, and use the setup checklist if that differs from your expectations.
Compare visible trails at a fixed speed
Follow the marker with your eyes. Look for a dark smear, a bright outline or a trail behind it. Compare the monitor’s overdrive or response settings one at a time using this same pattern. Keep the same page speed and display mode for each comparison. Restore the previous setting if a new setting produces a more distracting halo.
Use this visual comparison to record the trails you see and which settings change them. EIZO’s own monitor test also uses moving patterns to help visitors compare visible trails and monitor settings.
What to try next
If the marker pauses or jumps, compare uneven timing with blur and ghosting. If it moves regularly but leaves a trail, compare the monitor’s response settings at the same page speed. For the relationship between frame intervals, pixel transitions and refresh cycles, read FPS versus Hz.
For a still-image concern, inspect colors and gray fields. If the effect appears only in a game, compare the conditions before attributing it to the display.