I use all three.

Safari loses out when you run with a lot of Tabs. Both Chrome and Firefox knows when to unload tabs. ( Firefox even have about:unloads to tell you the order of Tabs it will unload! )

Try opening Tab Overview in Safari and it will start loading all the website for thumbnails, paging out to disk due to low memory, writing hundreds of GB to page. It also put Tabs on low running priority in the background rather than pausing them like Firefox or Chrome. ( Not sure if that is still the case with Safari 26, at least it was with 18 ). To combat that, restarting the browser time to time helps.

Safari is well tuned for iOS as a single tab, single page usage. On MacOS when doing many tabs it start to get slow and inefficient. And this is very much a Safari issue not an Webkit issue because Orion is a lot better at it.

And yes I have filed Radar report for many of the issues but I have come to the conclusion Apple doesn't care about multi tab usage on desktop Safari.