memory limit detection does not work

[yecril71pl]

When I try to use display to view a multiframe document, the command runs very slowly and it completely hogs my machine. If there is a lot of frames it may crash before displaying anything. However, if I explicitly set the memory limit to, say, 32 MiB, everything runs smoothly. Which is very unexpected because:

• the documentation says that ImageMagick chooses reasonable defaults, which turns out to be false,
• the documentation suggests that setting an explicit limit makes processing slower, whereas what really happens is just the opposite.

ImageMagick 6.6.9-9 2011-05-14 Q16