About LoadLine Web Runner
LoadLine Web Runner is an performance testing tool for Chromium-based browsers on Android. Powered by the open-source Crossbench benchmarking framework running in WebAssembly, it allows running reproducible, automated browser benchmarks directly from the web without complex local environment setup.
Key Features & Workflow:
- Direct Device Control: Connects to Android devices over USB using the WebUSB / WebADB API without requiring local ADB installations.
- Deterministic Replay: Replays realistic web browsing scenarios using recorded Web Page Replay (WPR) archives to eliminate live-network variance.
- Client-Side WASM Engine: Executes Crossbench benchmark logic and Perfetto Trace Processor hermetically in the browser.
Google Account & Cloud Storage Integration:
This application connects to Google Cloud Storage to download recorded WPR archive files (gs://...) required to execute benchmarks. Signing in with Google is used exclusively to request read-only access (https://www.googleapis.com/auth/devstorage.read_only) to stream and cache authorized archive files in your browser's local Cache Storage. No personal data, credentials, or browsing telemetry are stored or transmitted to external servers. For more details, see our Privacy Policy.
1. USB Device Connection
Status: Initializing...
Initializing web runner modules...
2. WPR Archives (Google Cloud Storage)
Cache Status: Checking cache...
To download the archive, please request access
here
(has to be done only once), then authorize below with the same account.
See our Privacy Policy.
Auth Status: Checking auth...
Alternative: manually enter GCP access token
Run
gcloud auth application-default print-access-token
in the terminal, and paste the token here: