diff --git a/codex/utils/asyncprofiler.nim b/codex/utils/asyncprofiler.nim
new file mode 100644
index 00000000..d93bfd31
--- /dev/null
+++ b/codex/utils/asyncprofiler.nim
@@ -0,0 +1,157 @@
+
+import std/[tables, macros, options, hashes]
+import pkg/chronos
+import pkg/chronos/timer
+
+
+type
+  FutureMetric = object
+    ## Holds average timing information for a given closure
+    closureLoc*: ptr SrcLoc
+    created*: Moment
+    start*: Option[Moment]
+    duration*: Duration
+    blocks*: int
+    initDuration*: Duration
+    durationChildren*: Duration
+
+  CallbackMetric = object
+    totalExecTime*: Duration
+    totalWallTime*: Duration
+    totalRunTime*: Duration
+    minSingleTime*: Duration
+    maxSingleTime*: Duration
+    count*: int64
+
+var
+  futureDurations: Table[uint, FutureMetric]
+  callbackDurations: Table[ptr SrcLoc, CallbackMetric]
+
+proc setFutureCreate(fut: FutureBase) {.raises: [].} =
+  ## used for setting the duration
+  let loc = fut.internalLocation[Create]
+  futureDurations[fut.id] = FutureMetric()
+  futureDurations.withValue(fut.id, metric):
+    metric.created = Moment.now()
+    echo loc, "; future create "
+
+proc setFutureStart(fut: FutureBase) {.raises: [].} =
+  ## used for setting the duration
+  let loc = fut.internalLocation[Create]
+  assert futureDurations.hasKey(fut.id)
+  futureDurations.withValue(fut.id, metric):
+    let ts = Moment.now()
+    metric.start = some ts
+    metric.blocks.inc()
+    echo loc, "; future start: ", metric.initDuration
+
+proc setFuturePause(fut, child: FutureBase) {.raises: [].} =
+  ## used for setting the duration
+  let loc = fut.internalLocation[Create]
+  let childLoc = if child.isNil: nil else: child.internalLocation[Create]
+  var durationChildren = ZeroDuration
+  var initDurationChildren = ZeroDuration
+  if childLoc != nil:
+    futureDurations.withValue(child.id, metric):
+      durationChildren = metric.duration
+      initDurationChildren = metric.initDuration
+  assert futureDurations.hasKey(fut.id)
+  futureDurations.withValue(fut.id, metric):
+    if metric.start.isSome:
+      let ts = Moment.now()
+      metric.duration += ts - metric.start.get()
+      metric.duration -= initDurationChildren
+      if metric.blocks == 1:
+        metric.initDuration = ts - metric.created # tricky,
+          # the first block of a child iterator also
+          # runs on the parents clock, so we track our first block
+          # time so any parents can get it
+      echo loc, "; child firstBlock time: ", initDurationChildren
+
+      metric.durationChildren += durationChildren
+      metric.start = none Moment
+    echo loc, "; future pause ", if childLoc.isNil: "" else: " child: " & $childLoc
+
+proc setFutureDuration(fut: FutureBase) {.raises: [].} =
+  ## used for setting the duration
+  let loc = fut.internalLocation[Create]
+  # assert  "set duration: " & $loc
+  var fm: FutureMetric
+  # assert futureDurations.pop(fut.id, fm)
+  futureDurations.withValue(fut.id, metric):
+    fm = metric[]
+
+  discard callbackDurations.hasKeyOrPut(loc, CallbackMetric(minSingleTime: InfiniteDuration))
+  callbackDurations.withValue(loc, metric):
+    echo loc, " set duration: ", callbackDurations.hasKey(loc)
+    metric.totalExecTime += fm.duration
+    metric.totalWallTime += Moment.now() - fm.created
+    metric.totalRunTime += metric.totalExecTime + fm.durationChildren
+    echo loc, " child duration: ", fm.durationChildren
+    metric.count.inc
+    metric.minSingleTime = min(metric.minSingleTime, fm.duration)
+    metric.maxSingleTime = max(metric.maxSingleTime, fm.duration)
+    # handle overflow
+    if metric.count == metric.count.typeof.high:
+      metric.totalExecTime = ZeroDuration
+      metric.count = 0
+
+onFutureCreate =
+  proc (f: FutureBase) {.gcsafe.} =
+    {.cast(gcsafe).}:
+      f.setFutureCreate()
+onFutureRunning =
+  proc (f: FutureBase) {.gcsafe.} =
+    {.cast(gcsafe).}:
+      f.setFutureStart()
+onFuturePause =
+  proc (f, child: FutureBase) {.gcsafe.} =
+    {.cast(gcsafe).}:
+      f.setFuturePause(child)
+onFutureStop =
+  proc (f: FutureBase) {.gcsafe.} =
+    {.cast(gcsafe).}:
+      f.setFuturePause(nil)
+      f.setFutureDuration()
+
+when isMainModule:
+  import std/unittest
+  import std/os
+
+  suite "async profiling":
+    test "basic profiling":
+      proc simpleAsyncChild() {.async.} =
+        echo "child sleep..."
+        os.sleep(25)
+
+      proc simpleAsync1() {.async.} =
+        for i in 0..1:
+          await sleepAsync(40.milliseconds)
+          await simpleAsyncChild()
+          echo "sleep..."
+          os.sleep(50)
+        
+      waitFor(simpleAsync1())
+
+      let metrics = callbackDurations
+      echo "\n=== metrics ==="
+      echo "execTime:\ttime to execute non-async portions of async proc"
+      echo "runTime:\texecution time + execution time of children"
+      echo "wallTime:\twall time elapsed for future's lifetime"
+      for (k,v) in metrics.pairs():
+        let count = v.count
+        if count > 0:
+          echo ""
+          echo "metric: ", $k
+          echo "count: ", count
+          echo "avg execTime:\t", v.totalExecTime div count, "\ttotal: ", v.totalExecTime
+          echo "avg wallTime:\t", v.totalWallTime div count, "\ttotal: ", v.totalWallTime
+          echo "avg runTime:\t", v.totalRunTime div count, "\ttotal: ", v.totalRunTime
+        if k.procedure == "simpleAsync1":
+          check v.totalExecTime >= 150.milliseconds()
+          check v.totalExecTime <= 170.milliseconds()
+
+          check v.totalRunTime >= 200.milliseconds()
+          check v.totalRunTime <= 230.milliseconds()
+          discard
+      echo ""
diff --git a/tests/config.nims b/tests/config.nims
index 55858427..620a0730 100644
--- a/tests/config.nims
+++ b/tests/config.nims
@@ -2,6 +2,8 @@
 --threads:on
 --tlsEmulation:off
 
+--d:chronosFuturesInstrumentation
+
 when not defined(chronicles_log_level):
   --define:"chronicles_log_level:NONE" # compile all log statements
   --define:"chronicles_sinks:textlines[dynamic]" # allow logs to be filtered at runtime