diff --git a/app/config.py b/app/config.py
index c96df35..a407a3e 100644
--- a/app/config.py
+++ b/app/config.py
@@ -44,8 +44,10 @@ class Settings(BaseSettings):
     schwab_symbol: str = "/ES"
     # Seconds between forming-bar emissions built from LEVEL_ONE_FUTURES ticks.
     # Set negative to drop the Level 1 subscription and take closed minute bars
-    # only. 1.0 is a candle that visibly moves without a broadcast per trade.
-    schwab_tick_seconds: float = 1.0
+    # only. Measured in regular hours, /ES supplies a price-changing trade far
+    # faster than this, so the value is the update rate: at 1.0 the throttle was
+    # the limiter and the chart felt sluggish.
+    schwab_tick_seconds: float = 0.25
     confluence_min_score: float = 28
     # Four hours, chosen from the sweep in scripts/calibrate_alerts.py. Suppression is
     # per price zone, so an unrelated zone still alerts immediately; this only
diff --git a/app/market/schwab.py b/app/market/schwab.py
index 27ba965..c7e7c19 100644
--- a/app/market/schwab.py
+++ b/app/market/schwab.py
@@ -37,6 +37,7 @@ FIELD_VOLUME = "VOLUME"
 FIELD_LAST_PRICE = "LAST_PRICE"
 FIELD_LAST_SIZE = "LAST_SIZE"
 FIELD_TRADE_TIME = "TRADE_TIME_MILLIS"
+FIELD_TOTAL_VOLUME = "TOTAL_VOLUME"
 
 
 def parse_level_one(message: dict) -> list[tuple[int, float | None, int]]:
@@ -57,7 +58,13 @@ def parse_level_one(message: dict) -> list[tuple[int, float | None, int]]:
         price = content.get(FIELD_LAST_PRICE)
         size = content.get(FIELD_LAST_SIZE)
         traded_at = content.get(FIELD_TRADE_TIME)
-        if price is None and (size is None or traded_at is None):
+        # A trade stamp alongside a moved cumulative volume is a trade even when
+        # neither the price nor the size field was resent. Size is left at zero
+        # rather than guessed from the volume delta: CHART_FUTURES replaces the
+        # minute's volume with the exchange's own figure a moment later, and two
+        # ways of counting the same trades is how double counting starts.
+        traded = size is not None or content.get(FIELD_TOTAL_VOLUME) is not None
+        if price is None and not (traded and traded_at is not None):
             continue
         millis = traded_at
         if millis is None:
diff --git a/app/runtime.py b/app/runtime.py
index 4dbae0b..9e5d397 100644
--- a/app/runtime.py
+++ b/app/runtime.py
@@ -1,10 +1,11 @@
 import asyncio
 import logging
-from dataclasses import dataclass, field
+from dataclasses import dataclass, field, replace
 
 from app.analysis.alerts import Alert, AlertEngine
 from app.bars.models import Bar, Timeframe
 from app.bars.aggregator import Aggregator
+from app.bars.session import bucket_start
 from app.analysis.bar_space import price_in_bar_space
 from app.analysis.horizontals import build_prior_day_levels
 from app.analysis.levels import Level
@@ -66,6 +67,9 @@ class Runtime:
             self.store.put(bar)
             self.price = bar.c
             self.broadcast({"type": "bar", "bar": bar})
+            for provisional in self.provisional_higher(bar):
+                self.store.put(provisional)
+                self.broadcast({"type": "bar", "bar": provisional})
             return
 
         evaluate_alerts = False
@@ -85,6 +89,41 @@ class Runtime:
             self.rebuild_levels()
             self.rebuild_clusters(evaluate_alerts=True)
 
+    def provisional_higher(self, bar: Bar) -> list[Bar]:
+        """Higher-timeframe bars including the minute still being traded.
+
+        The aggregator cannot be asked for these: it accumulates with
+        ``current.v += incoming.v``, so re-feeding the same forming minute on
+        every tick would add its volume to each higher timeframe again and
+        again. Its committed state — every minute that has actually closed — is
+        combined with the live minute here instead, without mutating it. The
+        next closed minute goes through the aggregator normally and replaces
+        what this produced, because the store keys on the bucket's timestamp.
+        """
+        out: list[Bar] = []
+        for tf in self.settings.enabled_timeframes:
+            if tf is Timeframe.M1:
+                continue
+            start = bucket_start(bar.t, tf)
+            base = self.aggregator.forming.get(tf)
+            if base is None or start > base.t:
+                # The live minute opens a bucket the aggregator has not started.
+                out.append(replace(bar, tf=tf, t=start, closed=False))
+                continue
+            if start < base.t:
+                continue
+            out.append(
+                replace(
+                    base,
+                    h=max(base.h, bar.h),
+                    l=min(base.l, bar.l),
+                    c=bar.c,
+                    v=base.v + bar.v,
+                    closed=False,
+                )
+            )
+        return out
+
     def broadcast(self, event: dict) -> None:
         for queue in self.subscribers.copy():
             if queue.full():
diff --git a/tests/test_runtime_alerts.py b/tests/test_runtime_alerts.py
index 6e3f2c1..2ca27cc 100644
--- a/tests/test_runtime_alerts.py
+++ b/tests/test_runtime_alerts.py
@@ -72,3 +72,32 @@ def test_blank_topic_sends_nothing(tmp_path, monkeypatch):
     monkeypatch.setattr("app.runtime.send_ntfy", record)
     asyncio.run(instance.notify("anything"))
     assert calls == [""]  # send_ntfy itself is the one that short-circuits
+
+
+def test_tick_bars_update_higher_timeframes_without_doubling_volume(tmp_path):
+    # The aggregator accumulates with `current.v += incoming.v`, so a forming
+    # minute re-sent on every tick would add its volume to each higher
+    # timeframe again and again. The provisional path must combine, not
+    # accumulate: five ticks in one minute leave the hour's volume equal to the
+    # closed minutes plus the live one, exactly once.
+    from app.bars.models import Bar
+
+    instance = runtime(tmp_path)
+
+    def minute(t, close, volume, closed=True):
+        return Bar(tf=Timeframe.M1, t=t, o=close, h=close, l=close, c=close,
+                   v=volume, closed=closed, symbol="/ES", source="test")
+
+    base = 1786356000  # top of an hour
+    asyncio.run(instance.on_bar(minute(base, 100.0, 10)))
+    asyncio.run(instance.on_bar(minute(base + 60, 101.0, 20)))
+    settled = [b for b in instance.store.get(Timeframe.H1) if b.t == base][-1].v
+    assert settled == 30
+
+    for _ in range(5):
+        asyncio.run(instance.on_bar(minute(base + 120, 102.0, 7, closed=False)))
+
+    hour = [b for b in instance.store.get(Timeframe.H1) if b.t == base][-1]
+    assert hour.v == 37, "the live minute's volume must be added once, not per tick"
+    assert hour.c == 102.0
+    assert hour.closed is False
diff --git a/tests/test_schwab_source.py b/tests/test_schwab_source.py
index 9dbce2c..06cabd6 100644
--- a/tests/test_schwab_source.py
+++ b/tests/test_schwab_source.py
@@ -267,3 +267,15 @@ def test_a_same_price_trade_keeps_its_volume():
 
 def test_a_quote_with_neither_price_nor_trade_is_still_skipped():
     assert parse_level_one({"content": [{"key": "/ES", "BID_SIZE": 12}]}) == []
+
+
+def test_a_trade_known_only_by_its_volume_still_counts():
+    # Neither price nor size resent, but the trade stamp moved and cumulative
+    # volume rose: a trade happened, and the candle should learn about it.
+    volume_only = {
+        "content": [
+            {"key": "/ES", "TRADE_TIME_MILLIS": 1786356932000, "TOTAL_VOLUME": 41,
+             "BID_SIZE": 8}
+        ]
+    }
+    assert parse_level_one(volume_only) == [(1786356932000, None, 0)]