• Press F12 to open the Debugger.
• Click the “Network” tab
• Press Ctrl+F5 to reaload the whole page (including previously cached files)
• under the list of transfered files in the greyish bar above the debug console (if enabled…) you see the total number of requests the site made and the total filesize that has been transfered; lower is better.

Picture: https://superuser.com/a/1718133

If you can’t answer this question you’re doing it wrong. It should be as simple as “how large are the files in my web hosting folder”. All this fucking tech stack bloat is so unnecessary.

Chrome reports the memory a tab uses if you hover over the tab. Look at the task manager within your browser. Try clicking on the burger bar, then “More tools” and “Task Manager” within the browser.

In the developer tools in the Network tab. FF sums it up at the bottom of the list when you reload (e.g. for this page “24 requests, 4.74 MB transferred”). Chrome must have something similar. Be sure to check “Disable cache” in the devtools.