I often have 10-20 tabs open or two separate browser windows side by side with multiple tabs in each. I don’t have any performance issues even though my computer ( on Windows 10) is almost 8+ years old and a low end one too. My primary browser is Opera which runs on the Chromium engine, just like Chrome does. There is a setting that might make a drastic performance improvement if you like having many tabs open - “delay loading of background tabs”. I’m not sure exactly how it works because when you open a tab in the background it does load… because it puts the page title on the tab bar. But, somehow it seems to make the browser handle all these open tabs just fine. It could just be an Opera thing too. I also use Firefox and Chrome, but not as my primary browser and not with a bunch of tabs open. I think a similar setting may be called “tab throttling” or something like that.
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