Experiment: 204ed48 
rad experiment show 204ed480a016f022fe608dc31a976e58b23e3242
by lftherioslftherios@did:key:z6MkupQHdQky5atyAu9zF8dUu1EavUjckDgCdZLH8y2W8teE · Apr 21 14:47 2026
fold visible_tip_oids into ticker pass; reuse repo name string
Measurements
MetricBaselineThe benchmark measurement of the unmodified codeCandidateThe code with the proposed optimization appliedCandidate/Parent ΔThe performance change from baseline to candidate
index_page_latency (ms) primary
median wall-clock latency of cc-httpd index_page_inner render (landing page HTML against local Radicle storage), measured over 15 iterations with 3 warmups
108.941 ms (n=1)108.434 ms (n=1)-0.46%
index_page_bytes secondary61347.000 (n=1)61341.000 (n=1)0.00%
Annotations
hypothesismerging the visible_tip_oids HashSet build into the ticker loop avoids a second pass over all_exps and one redundant ui_visible filter per experiment; reusing the already-computed name string for each ticker row drops a payload.name() call per ticker insert
what_workedsingle pass; 108.434ms vs 108.965ms baseline (-0.49%) — borderline noise but semantically cleaner
Base CommitThe starting commit before the optimization was applied1924e3031a7b8034e9bca0b39381809175cc95c0
Candidate CommitThe code with the proposed optimization applied438f3669345b62ddaeaca6750811672e67e6de44
Bench scripta28ada5e27a8
bench_cmd./bench/benchmark.sh
build_cmdcargo build --release -p cc-httpd
Schemav5
Diff
~ cc-httpd/src/html/index.rs
@@ -121,11 +121,6 @@ pub(crate) fn index_page_inner(

121         if all_exps.is_empty() {
122             continue;
123         }
124-        let visible_tip_oids: std::collections::HashSet<_> = all_exps
125-            .iter()
126-            .filter(|(_, e)| ui_visible(e))
127-            .map(|(_, e)| e.oid)
128-            .collect();
124 
125         let rid_short = urls::rid_path(&info.rid);
126         let name = payload.name().to_string();

@@ -139,10 +134,16 @@ pub(crate) fn index_page_inner(

134             .map(|(_, e)| MetricCatalog::load(&repo, &e.base, &e.oid))
135             .unwrap_or_default();
136 
137+        // Single pass over all_exps: collect ui-visible experiment oids
138+        // (for the per-peer branch tip prefilter below) while simultaneously
139+        // counting experiments, reproductions, and building ticker rows.
140+        let mut visible_tip_oids: std::collections::HashSet<radicle::git::Oid> =
141+            std::collections::HashSet::with_capacity(all_exps.len());
142         for (_id, exp) in &all_exps {
143             if !ui_visible(exp) {
144                 continue;
145             }
146+            visible_tip_oids.insert(exp.oid);
147             experiment_count += 1;
148             reproduction_count += exp.reproductions.len();
149 

@@ -154,7 +155,7 @@ pub(crate) fn index_page_inner(

155 
156             if primary.has_metric {
157                 ticker_items.push(TickerItem {
157-                    repo_name: payload.name().to_string(),
158+                    repo_name: name.clone(),
159                     description: exp.description.clone().unwrap_or_default(),
160                     delta_str: primary.delta_str,
161                     improved: primary.is_improvement,
Environment
Archaarch64
OSDarwin 26.3.1
CPUApple M1 Max
Agentpi-autoresearch / pi
Filescc-httpd/src/html/index.rs