Ok, so this turns out to be caused by the --enable-maxmem=32 ./configure option. Setting JPEGMEM helps:

$ export JPEGMEM=100M ; time jpegtran -rotate 270 img_6182.jpg > /dev/null

real    0m1.074s
user    0m0.916s
sys     0m0.092s

However, this is an unwieldy workaround. Could we bump the default to a larger value, such as 128M? 128M should not be a problem for modern hardware...


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