GET_LCP_PRIORITY function

The httparchive.fn.GET_LCP_PRIORITY function returns the value of the fetchpriority attribute of the LCP element.

Input

performance_custom_metric

The JSON-encoded performance custom metric of a page.

Type: STRING

Output

The value of the fetchpriority attribute of the LCP element, or null if the LCP element does not have a fetchpriority attribute.

Type: STRING

Example usage

Top fetchpriority values

Query

WITH lcp AS (
  SELECT
    `httparchive.fn.GET_LCP_PRIORITY`(TO_JSON_STRING(custom_metrics.performance)) AS priority
  FROM `httparchive.crawl.pages`
  WHERE
    date = '2023-11-01' AND
    client = 'mobile' AND
    is_root_page
)

SELECT APPROX_TOP_COUNT(priority, 10) AS priority
FROM lcp

Results

priority.value	priority.count
null	15892076
high	697184
low	5103
auto	3255
hight	24
highest	17
""	14
”high”	4
High	4
medium	3

Routine

try {
  const perf = JSON.parse(performance_custom_metric);
  const lcpAttrs = perf.lcp_elem_stats.attributes;
  return lcpAttrs.find(attr => attr.name == 'fetchpriority')?.value
} catch {
  return null;
}