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perf(frontend): throttle TPS chart updates to 10 Hz #112

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Merged
iamvukasin merged 1 commit into from
Aug 6, 2026
Merged

perf(frontend): throttle TPS chart updates to 10 Hz #112

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20 changes: 13 additions & 7 deletions frontend/components/network-activity-tracker/tps-chart.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -28,19 +28,25 @@ const CHART_WINDOW_MS = 5 * 60 * 1000
/** Smallest window to show early on, so the chart starts zoomed in rather than mostly empty. */
const MIN_WINDOW_MS = 3 * 1000

const SLIDING_CLOCK_INTERVAL_MS = 100

/**
* Drives a smoothly advancing "now" so the chart's x-domain slides
* continuously instead of jumping by one slot as each point arrives.
* Updates every animation frame for the smoothest motion; rAF auto-pauses
* when the tab is hidden.
* Publishes at 10 Hz for smooth motion without re-rendering Recharts every
* animation frame; rAF auto-pauses when the tab is hidden.
*/
function useSlidingNow(): number {
const [now, setNow] = useState(() => Date.now())

useEffect(() => {
let raf: number
const tick = () => {
setNow(Date.now())
let lastPublishedAt = 0
const tick = (timestamp: number) => {
if (timestamp - lastPublishedAt >= SLIDING_CLOCK_INTERVAL_MS) {
lastPublishedAt = timestamp
setNow(Date.now())
}
raf = requestAnimationFrame(tick)
}
raf = requestAnimationFrame(tick)
Expand All @@ -53,9 +59,9 @@ function useSlidingNow(): number {
/**
* Returns the history with its newest segment progressively "drawn": instead of
* the last point appearing fully-formed, a head vertex travels from the previous
* point to the newest one over the inter-arrival interval. `now` advances every
* frame, so the head moves smoothly. Once it reaches the newest point the segment
* is complete and the next arrival starts drawing the following one.
* point to the newest one over the inter-arrival interval. `now` advances with
* the sliding clock, so the head moves smoothly. Once it reaches the newest point
* the segment is complete and the next arrival starts drawing the following one.
*/
function drawHistory(history: TpsDataPoint[], now: number): TpsDataPoint[] {
if (history.length < 2) return history
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