[fiedzia]

The issue is simple to resolve - most ui frameworks will have some sort of virtual table that only display and manage elements user will see, so just use that (react window does that, but there are table variants that are doing all the work as well). This is a limitation of a browser/UI/OS more then react, as any ui element comes with a cost, though you'd need to know someone who knows about browsers, ui libraries and operating systems to explain where the cost comes from exactly, and you won't be able to do anything about it anyway (that's the problem with the frontend).