diff --git a/tidepool/src/cli.rs b/tidepool/src/cli.rs
index db845f9..63f5a6a 100644
--- a/tidepool/src/cli.rs
+++ b/tidepool/src/cli.rs
@@ -42,12 +42,12 @@ pub struct CliArgs {
 
 #[derive(Clone, Debug, Args)]
 pub struct OutputDataArgs {
-    /// Generate profiling data in the output.
-    #[arg(short = 'P', long)]
-    pub profile: bool,
     /// Generate the full list of moves in the output.
     #[arg(short = 'L', long)]
     pub list_moves: bool,
+    /// Generate algorithm metrics in the output.
+    #[arg(short = 'M', long)]
+    pub metrics: bool,
 }
 
 #[derive(Clone, Debug, Args)]
diff --git a/tidepool/src/main.rs b/tidepool/src/main.rs
index ead801d..91bfca4 100644
--- a/tidepool/src/main.rs
+++ b/tidepool/src/main.rs
@@ -341,6 +341,7 @@ fn run_simulation(
     exit_early: &atomic::AtomicBool,
 ) {
     let mut moves = data_args.list_moves.then(Vec::new);
+    let mut metrics = data_args.metrics.then(Vec::new);
     let seed = seed.unwrap_or_else(|| rand::thread_rng().next_u64());
     let weights = eval::Weights::default();
 
@@ -363,6 +364,9 @@ fn run_simulation(
             sim.matrix(),
             mino::Queue::new(sim.queue().hold(), sim.queue().next()),
         );
+        if data_args.metrics {
+            bot.start_instrumenting();
+        }
 
         while bot.iterations() < config.bot.iters {
             let gas = std::cmp::min(50_000, config.bot.iters - bot.iterations());
@@ -385,6 +389,9 @@ fn run_simulation(
         if let Some(moves) = moves.as_mut() {
             moves.push(output::Move { placement })
         }
+        if let Some(metrics) = metrics.as_mut() {
+            metrics.push(bot.metrics().unwrap());
+        }
 
         let status = Status {
             lines_left: sim.lines_left(),
@@ -396,17 +403,13 @@ fn run_simulation(
         }
     }
 
-    let profile = data_args.profile.then(|| output::Profile {
-        time: Instant::now() - time_start,
-    });
-
     let output = output::Output {
         seed,
         cleared: config.game.goal - sim.lines_left(),
         pieces: sim.pieces(),
         config: config.game,
         moves,
-        profile,
+        metrics,
     };
     if tx.send(Msg::Output(id, output.into())).is_err() {
         tracing::debug!("nobody received output id={id}");
diff --git a/tidepool/src/output.rs b/tidepool/src/output.rs
index 11a666a..289d946 100644
--- a/tidepool/src/output.rs
+++ b/tidepool/src/output.rs
@@ -1,6 +1,6 @@
+use fish::bot::Metrics;
 use mino::srs::Piece;
 use serde::Serialize;
-use std::time::Duration;
 
 use crate::config::GameConfig;
 
@@ -11,10 +11,13 @@ pub struct Output {
     pub config: GameConfig,
     pub pieces: usize,
     pub cleared: usize,
-    #[serde(default, skip_serializing_if = "Option::is_none")]
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub moves: Option<Vec<Move>>,
-    #[serde(default, skip_serializing_if = "Option::is_none")]
-    pub profile: Option<Profile>,
+    #[serde(
+        serialize_with = "ser::metrics",
+        skip_serializing_if = "Option::is_none"
+    )]
+    pub metrics: Option<Vec<Metrics>>,
 }
 
 impl Output {
@@ -30,16 +33,6 @@ pub struct Move {
     // TODO: spin?
 }
 
-#[derive(Serialize, Debug)]
-pub struct Profile {
-    #[serde(serialize_with = "ser::seconds")]
-    pub time: Duration,
-    // TODO: pps mean/variance
-    // TODO: timing stats for specific functions/routines
-    // TODO: stats info about top <N> evaluations
-    // TODO: histograms about selected nodes
-}
-
 #[derive(Copy, Clone, Debug)]
 pub struct SummaryStats<T: Copy> {
     count: usize,
@@ -167,11 +160,56 @@ mod ser {
         .serialize(serializer)
     }
 
-    pub fn seconds<S>(dur: &Duration, serializer: S) -> Result<S::Ok, S::Error>
+    pub fn metrics<S>(metrics: &Option<Vec<Metrics>>, serializer: S) -> Result<S::Ok, S::Error>
     where
         S: serde::Serializer,
     {
-        dur.as_secs_f64().serialize(serializer)
+        #[derive(Serialize)]
+        struct MoveMetrics {
+            start: NodeMetrics,
+            end: NodeMetrics,
+        }
+
+        #[derive(Serialize)]
+        struct NodeMetrics {
+            features: Vec<i32>,
+            heuristic: i32,
+            #[serde(flatten)]
+            rating: RatingVariant,
+            #[serde(skip_serializing_if = "Option::is_none")]
+            iteration: Option<u32>,
+        }
+
+        #[derive(Serialize)]
+        #[serde(untagged)]
+        enum RatingVariant {
+            NotApplicable,
+            Rating { rating: i32 },
+            Solution { solution: i32 },
+        }
+
+        metrics
+            .iter()
+            .flat_map(|m| m.iter())
+            .map(|m| MoveMetrics {
+                start: NodeMetrics {
+                    features: m.start_features.1.to_vec(),
+                    heuristic: m.start_heuristic,
+                    rating: RatingVariant::NotApplicable,
+                    iteration: None,
+                },
+                end: NodeMetrics {
+                    features: m.end_features.1.to_vec(),
+                    heuristic: m.end_heuristic,
+                    rating: match m.end_rating {
+                        (false, v) => RatingVariant::Rating { rating: v },
+                        (true, v) => RatingVariant::Solution { solution: -v },
+                    },
+                    iteration: Some(m.end_iteration),
+                },
+            })
+            .collect::<Vec<_>>()
+            .serialize(serializer)
     }
 
     pub fn summary_stats<S, T>(stats: &SummaryStats<T>, serializer: S) -> Result<S::Ok, S::Error>