Navigation timeout when running benchmark-web-vitals on page with File block embedding PDF

[westonruter]

I added a File block with a PDF being displayed inline:

When I attempt to test the performance of this page, I get timeout error:

$ npm run research -- benchmark-web-vitals -u https://wordpress.com/support/embed-a-pdf-file/ -n 1 -o csv

> research
> ./cli/run.mjs benchmark-web-vitals -u https://wordpress.com/support/embed-a-pdf-file/ -n 1 -o csv

TimeoutError: Navigation timeout of 30000 ms exceeded

Interestingly, if I change the value of waitUntil from networkidle0 to load:

diff --git a/cli/commands/benchmark-web-vitals.mjs b/cli/commands/benchmark-web-vitals.mjs
index 23ba228..59418be 100644
--- a/cli/commands/benchmark-web-vitals.mjs
+++ b/cli/commands/benchmark-web-vitals.mjs
@@ -252,7 +252,7 @@ async function benchmarkURL( browser, params ) {
 		// Load the page.
 		const response = await page.goto(
 			`${ params.url }?rnd=${ requestNum }`,
-			{ waitUntil: 'networkidle0' }
+			{ waitUntil: 'load' }
 		);
 		await page.addScriptTag( { content: scriptTag, type: 'module' } );

Then it works.

I don't have this issue for testing URLs that don't have embedded PDFs:

$ npm run research -- benchmark-web-vitals -u https://example.com/ -n 1 -o csv

> research
> ./cli/run.mjs benchmark-web-vitals -u https://example.com/ -n 1 -o csv

URL,https://example.com/
Success Rate,100%
FCP (median),148.6
LCP (median),148.6
TTFB (median),112.6
LCP-TTFB (median),36