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View imports_timing.js
// Know how fast your HTML Imports are.
// crbug.com/505279 - doesn't show sub-import resources.
var imports = document.querySelectorAll('link[rel="import"]');
[].forEach.call(imports, function(link) {
var entries = performance.getEntriesByName(link.href);
console.info('=== HTML Imports perf ===');
entries.forEach(function(e) {
console.log(e.name, 'took', e.duration, 'ms');
});
});