Running multiple automated load tests of a site to see if code changes / server config make it quicker

Im trying to work out which lazy loading techniques and server setup allow my to server a page quickest, currently im using this workflow :

• Test ping and download speed
• open quicktime screen recorder (so i can review the network tab and load times if there are any anomalies in the data to see what caused them)
• open a new incognito tab with cache disabled and network tab open
• load website
• save screencast
• log ping, download speed, time, date, commit version from git, website loading time into spreadsheet

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• After i have another test i can the spreadsheet and make a quantified decision on what works.

Running this workflow currently takes about 4 minutes each time i run it (im doing all of these manually, generally i run the same test a couple of times to get an average and then change the variables, image loading js script tweaks and also try it on different VPSs, try it with / without CDN to allow sharding etc.)

Is there an automated approach to doing to ? I guess i could setup a selenium script and run the tests, but i was wandering if there was an of the shelf solution ?

Ideally i would be able to say test it with the following git commits (although i would have to do the server config changes manually) but it would even be quicker i could automate the running, screencasts and logging of the tests.