Linux partition size

I found an old saved txt on optimal partition sizes of Linux. We now have (relatively) huge hard drives and Linux supports big hard drives and partitions but I was wondering if the old way would give a performance boost. Anyway, just to keep the record.

/boot 20M (a separate partition because of recommendations of various versions too) (Maybe 128M now?Let me see how big grub is next time. And I think I saw somewhere that this should use ext2.)

Swap twice the memory (red hat recommendation)(Or most of the time, with 1G memory, Linux won't normally use swap at all. So if you have a lot of memory, 1G could be enough)

/var (Saves log and email files. not very useful for home users. 1G?)

/home however much you need...

/usr give it a lot of spaces, 8G, softwares are saved here (or just put it all together with /)