GTmetrix

GTmetrix has created GTmetrix for WordPress – a WordPress plugin that actively keeps track of your WP install and sends you alerts if your site falls below certain criteria.
Run analyses, schedule reports on a daily, weekly or monthly basis, and receive alerts about the status of your site all from within your WordPress Admin!

GTmetrix for WordPress

Plugin isn't showing the toolbar link in the latest version of WP now :(

Fantastic plugin but...

GTmetrix can help you develop a faster, more efficient, and all-around improved website experience for your users. Your users will love you for it.

tecsys

This plugin is relying on a 3rd party as a service i.e. GT Metrix, Pagespeed Insights. 
We provide you both third party performance reports in single plugin.

Performance Checker

Hi,

Please check below error

test(array('url' => $url_to_test)); $test->get_results(); $fully_loaded_time=''; $onload_time=''; $page_size=''; $yslow_score=''; $pagespeed_score=''; $onload_duration=''; $page_load_time=''; $html_load_time=''; if($test->error()) { echo "

"; die($test->error()); } else { $results = $test->results(); $resources = $test->resources(); $fully_loaded_time=round($results['fully_loaded_time']/1000,1); $onload_time=round($results['onload_time']/1000,1); $page_size=round($results['page_bytes']/1000000,1); $yslow_score=$results['yslow_score']; $pagespeed_score=$results['pagespeed_score']; $onload_duration=$results['onload_duration']; $report_url=$results['report_url']; $page_load_time=round($results['page_load_time']/1000,1); $html_load_time=round($results['html_load_time']/1000,1); } ?> 

Thanks

More errors

This Plugin will show your site performance using Gt-Metrix and PageSpeed Insight Api.

GTmetrix for WordPress vs Performance Checker