Jspreadsheet Pro v12 benchmarks: original payment data, native viewport, sorting, filtering, editing, XLSX export and merged cells
Partial native-API port: Group, Pivot and collapse benchmarks are disabled, not simulated.
Panel clicks use native range selection; row marks also track the noncontiguous benchmark selections.
Official evaluation mode is enabled: no signup or personal key is required on localhost.
Serve this page from http://localhost or http://127.0.0.1, not file://.
Keep the original accounts.js beside this HTML.
Data files are loaded from data/, with a same-directory fallback. CDN access is required.
Integration and million-row performance still require validation with the actual Jspreadsheet build.
Full Printable and millions of merged ranges can exhaust browser memory.
XLSX uses a separate native worksheet with materialized values and a real header row; Panel is excluded.
Automatic sheet splitting is not implemented.