I have fixed this issue forever. I got a Thinkpad P50 with 64 gigs of ram. So, I just mount a tmpfs over ~/.cache.

I actually use a tmpfs for a few things:

    $ grep tmpfs /etc/fstab
    tmpfs	/tmp			tmpfs	nodev,nosuid,mode=1777,noatime	0 0
    tmpfs	/var/tmp/portage	tmpfs	noatime	0 0
    tmpfs	/home/zx2c4/.cache	tmpfs	noatime,nosuid,nodev,uid=1000,gid=1000,mode=0755	0 0