get_pagespeed: Query the Pagespeed API for a given page
In Phippsy/googlePageSpeedR:

Usage Arguments Value Examples

View source: R/get_pagespeed.R

get_pagespeed(ps_url = NULL, key = NULL, filter_tpr = NULL,
  locale = NULL, rule = NULL, screenshot = NULL, snapshots = NULL,
  strategy = NULL, utm_campaign = NULL, utm_source = NULL,
  fields = NULL)

`ps_url`	The URL which you'd like to analyse
`key`	The API key (not required) which you'll be using to query the Google API
`filter_tpr`	Indicates if third party resources should be filtered out before PageSpeed analysis. (boolean)
`locale`	The locale used to localize formatted results (string)
`rule`	A PageSpeed rule to run; if none are given, all rules are run (string)
`screenshot`	Indicates if binary data containing a screenshot should be included (boolean)
`snapshots`	Indicates if binary data containing snapshot images should be included (boolean)
`strategy`	The analysis strategy (desktop or mobile) to use, and desktop is the default (string)
`utm_campaign`	Campaign name for analytics. (string)
`utm_source`	Campaign source for analytics. (string)
`fields`	Selector specifying which fields to include in a partial response.

Returns a data frame containing key pagespeed insights for the given request

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jaguar <- get_pagespeed(ps_url = "http://www.jaguar.co.uk", key = "my_key", strategy = "desktop")

See also metrics reference at https://developers.google.com/web/tools/chrome-user-experience-report/#metrics