nandi.uk
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perf: summary mode for getIslands, lazy vertexMeta on detail view
Explore page fetches ?summary=true — skips vertexMeta (244KB saved)
and trims edges to source/target/connectionType. Full data loads
on demand when viewing an island detail. Also skips contrail init
in summary mode for faster cold starts.
523KB → 216KB, 1.2s → 230ms cold, 90ms warm.
👾 Generated with [Letta Code](https://letta.com)
Co-Authored-By: Letta Code <noreply@letta.com>
author
nandi
co-author
Letta Code
date
(May 14, 2026, 3:49 AM UTC)
commit
b7bce104
b7bce104c0cc0d0a025f5211f09dab58238a6746
parent
244c0c83
244c0c839219874f43c4f295a1118f8025ee2ed4
+28
-6
+17
-2
src/frontend/app.ts
+17
-2
src/frontend/app.ts
···
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const content = document.getElementById("page-content");
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if (!content) return;
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-
const island = islands.find(i => i.id === islandId);
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+
let island = islands.find(i => i.id === islandId);
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if (!island) {
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content.innerHTML = '<div class="empty">Island not found.</div>';
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return;
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+
}
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+
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// If vertexMeta is missing (summary mode), fetch full data
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+
if (!island.vertexMeta || Object.keys(island.vertexMeta).length === 0) {
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try {
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const data = await apiGet<{ islands: Island[] }>("/xrpc/org.latha.strata.getIslands?limit=50");
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const full = data.islands?.find(i => i.id === islandId);
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if (full) {
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island = full;
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// Update cached island too
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const idx = islands.findIndex(i => i.id === islandId);
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if (idx >= 0) islands[idx] = full;
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+
}
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+
} catch {}
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}
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const edgeList = island.edges!.map(e => {
···
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currentPage = "explore";
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// Try API first, fall back to server-rendered data
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+
// Use summary mode — skip vertexMeta (saves ~250KB)
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try {
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const data = await apiGet<{ islands: Island[] }>("/xrpc/org.latha.strata.getIslands");
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const data = await apiGet<{ islands: Island[] }>("/xrpc/org.latha.strata.getIslands?summary=true");
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islands = data.islands || [];
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} catch {
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const serverData = (window as any).__ISLANDS__;
+11
-4
src/worker.ts
+11
-4
src/worker.ts
···
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app.get("/xrpc/org.latha.strata.getIslands", async (c) => {
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const limit = Math.min(parseInt(c.req.query("limit") || "50"), 100);
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-
await ensureContrailReady(db);
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+
const summary = c.req.query("summary") === "true";
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+
if (!summary) await ensureContrailReady(db);
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const rows = await db
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.prepare("SELECT uri, record FROM records_strata ORDER BY time_us DESC LIMIT ?")
···
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}
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const vertices = [...vertexSet].sort();
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-
const vertexMeta = Object.fromEntries(await resolveVertexMeta(db, vertices));
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const analysis = rec.analysis || {};
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-
const analysis = rec.analysis || {};
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// Summary mode: minimal payload for explore page canvas
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// Skip vertexMeta (122KB) and trim edges to just source/target
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const vertexMeta = summary ? {} : Object.fromEntries(await resolveVertexMeta(db, vertices));
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const trimmedEdges = summary
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? edges.map(e => ({ source: e.source, target: e.target, connectionType: e.connectionType }))
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: edges;
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+
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islands.push({
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-
id, lexmin, vertices, edges, vertexMeta,
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+
id, lexmin, vertices, edges: trimmedEdges, vertexMeta,
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title: analysis.title || null,
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strata: analysis.synthesis ? {
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prose: analysis.synthesis || "", title: analysis.title || "",