Client-side SDK timing report

Fingerprint Pro (Plaid Link's configuration) alongside the SEON JavaScript agent — measuring what each SDK costs alone and what it costs when both run on the same page.

Serve this file over http:// — ESM import from a CDN and the SEON agent will not work from file://. From the folder containing this file run python3 -m http.server 8080 and open http://localhost:8080/sdk-timing-report.html.

Fingerprint Pro configuration

Public API key (browser token)

Region

Agent CDN base

endpoints (one per line — leave empty for Fingerprint defaults)

aggressiveOptimization: true

extendedSignalCollection: true

get({ linkedId }) — as Plaid calls it

What the timer covers

idle

SEON configuration

Agent script

region

fieldTimeoutMs

networkTimeoutMs

call seon.init() on page load (behavioral signals)

re-init before every run

performanceMode: true

silentMode: true

geolocation.enabled (canPrompt: false)

idle

Scenarios — click to measure

gap between runs (ms)

idle

Solo baselines & contention

Fingerprint solo—

SEON solo—

Best combined wall—

Sequential sum (1+2)—

Saved by overlapping—

Δ vs solo in the table below is the extra time each SDK took in that run compared with its own solo baseline — that is the cost of the two agents competing for the main thread, workers and network.

Runs

#	Scenario	Wall	FP total	FP start / get	Δ FP	SEON	Δ SEON	Timeline	Result

Reference — Fingerprint Pro config extracted from Plaid Link's flink.js

function buildFingerprintConfig(apiKey, worker) {
  var i = {
    apiKey: apiKey,                       // production: "ENBtQILE9DAzCqo0tmlt"
    region: "us",
    endpoints: FP_CUSTOM_SUBDOMAIN,       // "https://f.plaid.com"
    worker: worker,                       // dedicated Worker instance
    aggressiveOptimization: true,         // undocumented Pro flag
    extendedSignalCollection: true,
    modules: [ makeValidationModule() ]
  };
  i.endpoints = [
    new URL("/e265wpihyb/", window.location.origin).toString(),  // first-party proxy path
    FP_CUSTOM_SUBDOMAIN                                          // fallback
  ];
  return i;
}
// later: agent = start(buildFingerprintConfig(key, worker)); await agent.get({ linkedId });

The worker and modules options need Plaid's own bundle, so this harness omits them; everything else is reproducible. Plaid's first-party endpoint /e265wpihyb/ only exists on Plaid's origin — the preset therefore keeps just https://f.plaid.com, and requests may be rejected if their key is origin-restricted. Use your own key for real numbers.