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Vim is now like Emacs

No wonder my system was swapping like mad. I only have 512 Mb, so when I started 4 vim instances, the system became unusable:

lapse:~> ps up 18139
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
madduck  18139  2.6 26.8 225460 214645 pts/10  S+   01:23   0:01 vim
                         ^^^^^^ ^^^^^^

I don't claim I understand memory management. But what the heck is going on?

If I start vim without my configuration (vim -u NONE), the problem goes away. However, starting vim on another machine (remote, via non-X-forwarding SSH) with the same configuration, it uses a few megabytes, no more.