So this is not just limited to Tor browser but Firefox too and others. Tor browser uses a more complex way to get people online and this is understandable that such techniques will add more overhead. My question here is not about this part. Question here is what can we do to limit the negative impact on system resources? Increasing RAM, CPU and drive usage slowly effecting not-so-modern machines. This is true for majority of browsers and not just this one.
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It’s called bloatware and is not restricted to browsers. It’s everywhere as vendors add more and more stuff into their software in their effort to generate more $$. Firefox vanilla now allows you to edit PDFs.
As things evolve it is normal for software to get bigger and bigger and use more and more. The original PC used max 256 Kilobytes of memory. There is more than that on a toaster. 
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Well said and what a world we live in, I don’t know maybe one day that toaster will boot Windows “Home” version and would roast the user unless they choose to accept the terms! 
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Don’t give them any ideas.
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You might want to look into the suckless philosophy- software that sucks less | suckless.org software that sucks less.
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