Chrome: API For Performance Data
Problem Descritpion How can I access the data from the Chrome Performance tool either from the browser console or using Chrome driver methods when using Selenium? In particular, I
Solution 1:
If you want to access the Performance Data from the Chrome Developer Tool using ChromeDriver you can use the following code block :
Selenium-Python Snippet
from selenium import webdriver driver=webdriver.Chrome(executable_path=r'C:\Utility\BrowserDrivers\chromedriver.exe') driver.get("http://www.google.com") performance_data = driver.execute_script("return window.performance.getEntries();") print (performance_data)The parameters extracted are as follows :
connectEnd Time when server connection is finished. connectStart Time just before server connection begins. domComplete Time just before document readiness completes. domContentLoadedEventEnd Time after DOMContentLoaded event completes. domContentLoadedEventStart Time just before DOMContentLoaded starts. domInteractive Time just before readiness set to interactive. domLoading Time just before readiness set to loading. domainLookupEnd Time after domain name lookup. domainLookupStart Time just before domain name lookup. fetchStart Time when the resource starts being fetched. loadEventEnd Time when the load event is complete. loadEventStart Time just before the load event is fired. navigationStart Time after the previous document begins unload. redirectCount Number of redirects since the last non-redirect. redirectEnd Time after last redirect response ends. redirectStart Time of fetch that initiated a redirect. requestStart Time just before a server request. responseEnd Time after the end of a response or connection. responseStart Time just before the start of a response. timing Reference to a performance timing object. navigation Reference to performance navigation object. performance Reference to performance object for a window. type Type of the last non-redirect navigation event. unloadEventEnd Time after the previous document is unloaded. unloadEventStart Time just before the unload event is fired.
Console Output :
Page Title is : Google
[{'connectEnd': 2725.146514015987, 'connectStart': 1503.1734234800108, 'decodedBodySize': 204837, 'domComplete': 7603.4821342458235, 'domContentLoadedEventEnd': 4588.4400826362535, 'domContentLoadedEventStart': 4576.987229310746, 'domInteractive': 4559.208601432438, 'domainLookupEnd': 1503.1734234800108, 'domainLookupStart': 1503.1734234800108, 'duration': 7623.300733238722, 'encodedBodySize': 61075, 'entryType': 'navigation', 'fetchStart': 1503.1734234800108, 'initiatorType': 'navigation', 'loadEventEnd': 7623.300733238722, 'loadEventStart': 7603.516579526861, 'name': 'document', 'nextHopProtocol': 'h2', 'redirectCount': 0, 'redirectEnd': 1501.686197816412, 'redirectStart': 22.057947498907886, 'requestStart': 2725.729247123413, 'responseEnd': 3624.7713441197043, 'responseStart': 3349.3679493549, 'secureConnectionStart': 2049.7916668355165, 'startTime': 0, 'transferSize': 61926, 'type': 'navigate', 'unloadEventEnd': 0, 'unloadEventStart': 0, 'workerStart': 0}, {'connectEnd': 3388.3040845619494, 'connectStart': 3388.3040845619494, 'decodedBodySize': 1730, 'domainLookupEnd': 3388.3040845619494, 'domainLookupStart': 3388.3040845619494, 'duration': 237.3373068328902, 'encodedBodySize': 1730, 'entryType': 'resource', 'fetchStart': 3388.3040845619494, 'initiatorType': 'img', 'name': 'https://www.google.co.in/logos/doodles/2018/doodle-snow-games-day-15-5907794870927360.4-s.png', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 3439.3892730100556, 'responseEnd': 3625.6413913948395, 'responseStart': 3625.271003314041, 'secureConnectionStart': 0, 'startTime': 3388.3040845619494, 'transferSize': 2242, 'workerStart': 0}, {'connectEnd': 0, 'connectStart': 0, 'decodedBodySize': 0, 'domainLookupEnd': 0, 'domainLookupStart': 0, 'duration': 230.20794413542762, 'encodedBodySize': 0, 'entryType': 'resource', 'fetchStart': 3425.689371645131, 'initiatorType': 'css', 'name': 'https://ssl.gstatic.com/gb/images/i1_1967ca6a.png', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 0, 'responseEnd': 3655.8973157805594, 'responseStart': 0, 'secureConnectionStart': 0, 'startTime': 3425.689371645131, 'transferSize': 0, 'workerStart': 0}, {'connectEnd': 0, 'connectStart': 0, 'decodedBodySize': 0, 'domainLookupEnd': 0, 'domainLookupStart': 0, 'duration': 969.9734406621285, 'encodedBodySize': 0, 'entryType': 'resource', 'fetchStart': 3502.3913129811713, 'initiatorType': 'script', 'name': 'https://www.gstatic.com/external_hosted/createjs/createjs-2015.11.26.min.js', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 0, 'responseEnd': 4472.364753643298, 'responseStart': 0, 'secureConnectionStart': 0, 'startTime': 3502.3913129811713, 'transferSize': 0, 'workerStart': 0}, {'connectEnd': 3520.930168473896, 'connectStart': 3520.930168473896, 'decodedBodySize': 12232, 'domainLookupEnd': 3520.930168473896, 'domainLookupStart': 3520.930168473896, 'duration': 134.0411771046674, 'encodedBodySize': 12232, 'entryType': 'resource', 'fetchStart': 3520.930168473896, 'initiatorType': 'css', 'name': 'https://www.google.co.in/logos/2018/snowgames_bobsled/cta.png', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 3525.3821197382813, 'responseEnd': 3654.971345578564, 'responseStart': 3625.955856548778, 'secureConnectionStart': 0, 'startTime': 3520.930168473896, 'transferSize': 12745, 'workerStart': 0}, {'connectEnd': 4527.024551785848, 'connectStart': 4527.024551785848, 'decodedBodySize': 842405, 'domainLookupEnd': 4527.024551785848, 'domainLookupStart': 4527.024551785848, 'duration': 2632.3253968704244, 'encodedBodySize': 265174, 'entryType': 'resource', 'fetchStart': 4527.024551785848, 'initiatorType': 'script', 'name': 'https://www.google.co.in/logos/2018/snowgames_bobsled/snowgames_bobsled18.2.js', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 4528.843667863202, 'responseEnd': 7159.3499486562705, 'responseStart': 4946.163646693538, 'secureConnectionStart': 0, 'startTime': 4527.024551785848, 'transferSize': 265741, 'workerStart': 0}, {'connectEnd': 4558.896162471504, 'connectStart': 4558.896162471504, 'decodedBodySize': 0, 'domainLookupEnd': 4558.896162471504, 'domainLookupStart': 4558.896162471504, 'duration': 1005.3106518587082, 'encodedBodySize': 0, 'entryType': 'resource', 'fetchStart': 4558.896162471504, 'initiatorType': 'other', 'name': 'https://www.google.co.in/gen_204?s=webaft&atyp=csi&ei=N6mPWp6mC8H00ASJtoL4Ag&rt=wsrt.3384,aft.1175,prt.1175', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 4560.575876470308, 'responseEnd': 5564.206814330209, 'responseStart': 5564.1444075857435, 'secureConnectionStart': 0, 'startTime': 4558.896162471504, 'transferSize': 358, 'workerStart': 0}, {'connectEnd': 4576.353841378264, 'connectStart': 4576.353841378264, 'decodedBodySize': 417606, 'domainLookupEnd': 4576.353841378264, 'domainLookupStart': 4576.353841378264, 'duration': 1903.6302084304214, 'encodedBodySize': 144417, 'entryType': 'resource', 'fetchStart': 4576.353841378264, 'initiatorType': 'script', 'name': 'https://www.google.co.in/xjs/_/js/k=xjs.s.en.smQ6-n1iGHA.O/m=sx,sb,cdos,cr,elog,hsm,jsa,r,d,csi/am=wCLkeMEAyP8JgogEKwgsQIpgGBA/rt=j/d=1/t=zcms/rs=ACT90oH8FZej9QmzW2qBqlOOQ7DASmnKAA', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 4578.110550711152, 'responseEnd': 6479.984049808687, 'responseStart': 5564.372556917789, 'secureConnectionStart': 0, 'startTime': 4576.353841378264, 'transferSize': 144999, 'workerStart': 0}, {'connectEnd': 0, 'connectStart': 0, 'decodedBodySize': 0, 'domainLookupEnd': 0, 'domainLookupStart': 0, 'duration': 574.9679253647753, 'encodedBodySize': 0, 'entryType': 'resource', 'fetchStart': 4791.30009458269, 'initiatorType': 'script', 'name': 'https://www.gstatic.com/og/_/js/k=og.og2.en_US.SpCLDXmWlPM.O/rt=j/m=def/exm=in,fot/d=1/ed=1/rs=AA2YrTtMoJJMGQfOfYZyZ7reaiaiva99OQ', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 0, 'responseEnd': 5366.2680199474635, 'responseStart': 0, 'secureConnectionStart': 0, 'startTime': 4791.30009458269, 'transferSize': 0, 'workerStart': 0}, {'connectEnd': 0, 'connectStart': 0, 'decodedBodySize': 0, 'domainLookupEnd': 0, 'domainLookupStart': 0, 'duration': 1586.0147296126488, 'encodedBodySize': 0, 'entryType': 'resource', 'fetchStart': 5417.5655534222005, 'initiatorType': 'script', 'name': 'https://apis.google.com/_/scs/abc-static/_/js/k=gapi.gapi.en.29tAKSAI8cc.O/m=gapi_iframes,googleapis_client,plusone/rt=j/sv=1/d=1/ed=1/am=IA/rs=AHpOoo82FxkTgGRAoVn-fgFU3zdQ5QIqEw/cb=gapi.loaded_0', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 0, 'responseEnd': 7003.580283034848, 'responseStart': 0, 'secureConnectionStart': 0, 'startTime': 5417.5655534222005, 'transferSize': 0, 'workerStart': 0}, {'connectEnd': 6646.626267079796, 'connectStart': 6646.626267079796, 'decodedBodySize': 83168, 'domainLookupEnd': 6646.626267079796, 'domainLookupStart': 6646.626267079796, 'duration': 783.8056119062338, 'encodedBodySize': 27299, 'entryType': 'resource', 'fetchStart': 6646.626267079796, 'initiatorType': 'script', 'name': 'https://www.google.co.in/xjs/_/js/k=xjs.s.en.smQ6-n1iGHA.O/m=aa,abd,async,dvl,foot,fpe,ipv6,lu,m,mu,sf,sonic,d3l/am=wCLkeMEAyP8JgogEKwgsQIpgGBA/exm=sx,sb,cdos,cr,elog,hsm,jsa,r,d,csi/rt=j/d=1/ed=1/t=zcms/rs=ACT90oH8FZej9QmzW2qBqlOOQ7DASmnKAA?xjs=s1', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 6648.111871788991, 'responseEnd': 7430.431878986027, 'responseStart': 7159.731278179281, 'secureConnectionStart': 0, 'startTime': 6646.626267079796, 'transferSize': 27880, 'workerStart': 0}, {'connectEnd': 0, 'connectStart': 0, 'decodedBodySize': 0, 'domainLookupEnd': 0, 'domainLookupStart': 0, 'duration': 930.0310980101976, 'encodedBodySize': 0, 'entryType': 'resource', 'fetchStart': 6668.677730761095, 'initiatorType': 'img', 'name': 'https://www.google.com/textinputassistant/tia.png', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 0, 'responseEnd': 7598.708828771292, 'responseStart': 0, 'secureConnectionStart': 0, 'startTime': 6668.677730761095, 'transferSize': 0, 'workerStart': 0}, {'connectEnd': 7222.302954756732, 'connectStart': 7222.302954756732, 'decodedBodySize': 469, 'domainLookupEnd': 7222.302954756732, 'domainLookupStart': 7222.302954756732, 'duration': 208.68612730489625, 'encodedBodySize': 469, 'entryType': 'resource', 'fetchStart': 7222.302954756732, 'initiatorType': 'img', 'name': 'https://www.google.co.in/logos/2018/snowgames_bobsled/main-sprite.png', 'nextHopProtocol': 'h2', 'redirectEnd': 0, 'redirectStart': 0, 'requestStart': 7223.911346761861, 'responseEnd': 7430.989082061627, 'responseStart': 7430.7698479787905, 'secureConnectionStart': 0, 'startTime': 7222.302954756732, 'transferSize': 980, 'workerStart': 0}]
From this output you can easily pull out the performance stats of your interest.
Solution 2:
Right-click on a Performance recording and select Save Profile. It'll give you a LOT of data, but should probably include whatever you need (it's the source data for the Performance recording report visualization, I think).
The underlying protocol that DevTools uses to get data from the browser is called the Chrome DevTools Protocol. Other clients, such as Selenium, can start a session with the browser (like DevTools does), and use the protocol to get the same data that DevTools gets. The underlying protocol method is called Performance.getMetrics. I'm not familiar with Selenium, but it should be possible to hook into the CDP, somehow.
You can also automate this with Puppeteer. I provide an example of using Puppeteer to access DevTools features in Using DevTools Features Without Opening DevTools.
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