[Evolution] Virtual Memory gone mad

[Jonathan Ryshpan <jonrysh pacbell net>]

Investigating why my computer had suddenly become very s.l.o.w, I
noticed that virtual memory usage had become very large.  In particular
the usage by evolution and evolution-data-server look large, amounting
together to only a little less than 2 GBytes.  Can anyone explain this?
Following are their entries extracted from "$ ps axuw".

 PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
2656  1.2  5.2 1668576 53708 ?       Sl   12:20   1:26 evolution
2827  0.0  0.2  313216  2804 ?       Sl   12:21   0:00 /usr/libexec/evolution-data-server-2.24 ...

For an old-line embedded systems programmer, who used to think in terms
of KBytes, this looks a little excessive.

Thanks - jon