websocketd – Connect CGI style to a WebSocket.
Example of how perf budgets change by network connection – “Network latency is a jerk.”, that and packet loss.
Using DevTools from Puppeteer – The example here is setting throttled network and CPU.
Correlating Performance Metrics to Page Characteristics – Great write up on which factors have the biggest impact on various metrics.
Front-End Performance Checklist 2019 – So many resources.
LiteCLI – SQLite command line client.
Stand-alone HTTP/2 prioritization test – This version just requires an image hosted on the site being tested.