diff --git a/client/src/Components/monitors/charts/HistogramDetails.tsx b/client/src/Components/monitors/charts/HistogramDetails.tsx
index 5c3970d3c..0736abd6c 100644
--- a/client/src/Components/monitors/charts/HistogramDetails.tsx
+++ b/client/src/Components/monitors/charts/HistogramDetails.tsx
@@ -122,7 +122,10 @@ export const HistogramDetails = ({
 	const theme = useTheme();
 	const uiTimezone = useSelector((state: RootState) => state.ui.timezone);
 	const yMax = useMemo(() => {
-		const totals = checks.map((check) => check.avgResponseTime || 0);
+		const totals = checks.map((check) => {
+			const phaseSum = PHASE_KEYS.reduce((sum, key) => sum + (check[key] ?? 0), 0);
+			return Math.max(check.avgResponseTime ?? 0, phaseSum);
+		});
 		return computeYAxisCap(totals);
 	}, [checks]);
 
diff --git a/client/src/Components/monitors/charts/HistogramDetailsStacked.tsx b/client/src/Components/monitors/charts/HistogramDetailsStacked.tsx
new file mode 100644
index 000000000..2ef74f56b
--- /dev/null
+++ b/client/src/Components/monitors/charts/HistogramDetailsStacked.tsx
@@ -0,0 +1,207 @@
+import type { GroupedUptimeCheck } from "@/Types/Check";
+import type { TooltipProps } from "recharts";
+import type { NameType, ValueType } from "recharts/types/component/DefaultTooltipContent";
+import type { Theme } from "@mui/material/styles";
+import type { RootState } from "@/Types/state";
+import { Clock } from "lucide-react";
+import prettyMilliseconds from "pretty-ms";
+
+import Stack from "@mui/material/Stack";
+import {
+	Area,
+	AreaChart,
+	CartesianGrid,
+	ResponsiveContainer,
+	YAxis,
+	XAxis,
+	Tooltip,
+} from "recharts";
+import { BaseBox, BaseChart, Dot } from "@/Components/design-elements";
+import Typography from "@mui/material/Typography";
+import { XTick } from "@/Components/monitors/charts/XTick";
+
+import { formatDateWithTz, tooltipDateFormatLookup } from "@/Utils/TimeUtils";
+import { useSelector } from "react-redux";
+import { useMemo } from "react";
+import { useTheme } from "@mui/material";
+import { SPACING } from "@/Utils/Theme/constants";
+import { computeYAxisCap } from "@/Components/monitors/charts/ChartUtils";
+
+export const PHASE_KEYS = [
+	"avgDns",
+	"avgTcp",
+	"avgTls",
+	"avgRequest",
+	"avgFirstByte",
+	"avgDownload",
+] as const;
+
+const PHASE_COLOR_KEYS = {
+	avgDns: "dns",
+	avgTcp: "tcp",
+	avgTls: "tls",
+	avgRequest: "request",
+	avgFirstByte: "firstByte",
+	avgDownload: "download",
+} as const;
+
+const PHASE_LABELS: Record<(typeof PHASE_KEYS)[number], string> = {
+	avgDns: "DNS",
+	avgTcp: "TCP",
+	avgTls: "TLS",
+	avgRequest: "Request",
+	avgFirstByte: "First byte",
+	avgDownload: "Download",
+};
+
+type TimingPhaseToolTipProps = TooltipProps<ValueType, NameType> & {
+	range: string;
+	theme: Theme;
+	uiTimezone: string;
+};
+
+const TimingPhasesToolTip = ({
+	active,
+	payload,
+	range,
+	theme,
+	uiTimezone,
+}: TimingPhaseToolTipProps) => {
+	if (!active || !payload?.length) return null;
+	const bucket = payload[0].payload as GroupedUptimeCheck;
+	const total = PHASE_KEYS.reduce((sum, key) => sum + bucket[key], 0);
+	const format = tooltipDateFormatLookup(range);
+	return (
+		<BaseBox sx={{ py: theme.spacing(2), px: theme.spacing(4) }}>
+			<Typography>{formatDateWithTz(bucket.bucketDate, format, uiTimezone)}</Typography>
+			<Typography>Total: {prettyMilliseconds(total)}</Typography>
+			{PHASE_KEYS.map((key) => (
+				<Stack
+					alignItems={"center"}
+					direction="row"
+					key={key}
+					gap={SPACING.LG}
+				>
+					<Dot
+						size={"12px"}
+						color={theme.palette.chart.phases[PHASE_COLOR_KEYS[key]]}
+					/>
+					<Typography>
+						{PHASE_LABELS[key]}:{" "}
+						{prettyMilliseconds(bucket[key], {
+							formatSubMilliseconds: true,
+							compact: true,
+						})}
+					</Typography>
+				</Stack>
+			))}
+		</BaseBox>
+	);
+};
+
+export const HistogramDetailsStacked = ({
+	checks = [],
+	range,
+}: {
+	checks: GroupedUptimeCheck[];
+	range: string;
+}) => {
+	const theme = useTheme();
+	const uiTimezone = useSelector((state: RootState) => state.ui.timezone);
+
+	// Cap the y domain at 2x the p95 of bucket totals, so typical stacks sit
+	// around mid-height with headroom above
+	const yMax = useMemo(() => {
+		const totals = checks.map((check) =>
+			PHASE_KEYS.reduce((sum, key) => sum + check[key], 0)
+		);
+		return computeYAxisCap(totals);
+	}, [checks]);
+
+	return (
+		<BaseChart
+			icon={
+				<Clock
+					size={20}
+					strokeWidth={1.5}
+				/>
+			}
+			title="Timing phases"
+		>
+			<ResponsiveContainer
+				width="100%"
+				height={300}
+			>
+				<AreaChart data={checks.slice()}>
+					<CartesianGrid
+						stroke={theme.palette.divider}
+						strokeWidth={1}
+						strokeOpacity={1}
+						fill="transparent"
+						vertical={false}
+					/>
+					<defs>
+						{PHASE_KEYS.map((key) => (
+							<linearGradient
+								key={key}
+								id={`phaseGradient-${key}`}
+								x1="0"
+								y1="0"
+								x2="0"
+								y2="1"
+							>
+								<stop
+									offset="0%"
+									stopColor={theme.palette.chart.phases[PHASE_COLOR_KEYS[key]]}
+									stopOpacity={0.8}
+								/>
+								<stop
+									offset="100%"
+									stopColor={theme.palette.chart.phases[PHASE_COLOR_KEYS[key]]}
+									stopOpacity={0.2}
+								/>
+							</linearGradient>
+						))}
+					</defs>
+					<YAxis
+						hide
+						// scale="sqrt"
+						domain={[0, yMax ?? "auto"]}
+						allowDataOverflow
+					/>
+					<XAxis
+						axisLine={false}
+						tickLine={false}
+						dataKey="bucketDate"
+						tick={(props) => (
+							<XTick
+								{...props}
+								range={range}
+							/>
+						)}
+					/>
+					<Tooltip
+						content={(props) => (
+							<TimingPhasesToolTip
+								{...props}
+								range={range}
+								theme={theme}
+								uiTimezone={uiTimezone}
+							/>
+						)}
+					/>
+					{PHASE_KEYS.map((key) => (
+						<Area
+							key={key}
+							type="monotone"
+							stackId={1}
+							dataKey={key}
+							stroke={theme.palette.chart.phases[PHASE_COLOR_KEYS[key]]}
+							fill={`url(#phaseGradient-${key})`}
+						/>
+					))}
+				</AreaChart>
+			</ResponsiveContainer>
+		</BaseChart>
+	);
+};