Optimize transaction filtering, search debounce, and component memoization

[Copilot]

Identified and fixed four performance bottlenecks causing unnecessary iterations, re-renders, and memory allocations.

Changes

• Transaction categorization (UsernameProfileSectionHeatmap): Combined 4 sequential .filter() calls into single .reduce() pass. Changed ENS address lookups from Array (O(n)) to Set (O(1)). Reduces iterations by ~75% (e.g., 4000→1000 for 1k transactions).

• Search input (SearchBar): Implemented missing debounce (300ms) with local state for immediate UI feedback. Added useEffect cleanup to prevent setState on unmounted component.

• Ecosystem cards (List): Wrapped AnimatedEcosystemCard with React.memo() to prevent re-renders when props unchanged.

• Date operations (UsernameProfileSectionHeatmap): Eliminated duplicate Date object creation using Map cache. Preserves timezone behavior while reducing N+M→N allocations.

Example: Transaction filtering

Before:

setTokenSwapCount(allTransactions.filter(tx => /* swap logic */).length);
setEnsCount(allTransactions.filter(tx => ensAddresses.includes(tx.to)).length);
setBridgeCount(allTransactions.filter(tx => bridges.has(tx.to)).length);
setLendCount(allTransactions.filter(tx => /* lend logic */).length);

After:

const ENS_ADDRESSES = new Set([...]); // Module scope

const counts = allTransactions.reduce((acc, tx) => {
  if (/* swap logic */) acc.tokenSwap++;
  if (ENS_ADDRESSES.has(tx.to)) acc.ens++;
  if (bridges.has(tx.to)) acc.bridge++;
  if (/* lend logic */) acc.lend++;
  return acc;
}, { tokenSwap: 0, ens: 0, bridge: 0, lend: 0 });

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• fonts.googleapis.com
  • Triggering command: /opt/hostedtoolcache/node/24.13.0/x64/bin/node /opt/hostedtoolcache/node/24.13.0/x64/bin/node /home/REDACTED/work/web/web/apps/web/node_modules/next/dist/bin/next build -collect-logs (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Identify and suggest improvements to slow or inefficient code.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.