malloc in the slow lane

hi,
	just came across a 'anomality'. The kernel is -current,
the same program, compiled under -stable, runs 'fast', while
the compiled under -current, is slowwwwwwwwwwww.

According to the UPDATING note, this is supposed to be expected, but
can't find a fix.

some data:
i386-freebsd5.2/memsize:
        libm.so.2 => /lib/libm.so.2 (0x48077000)
        libc.so.5 => /lib/libc.so.5 (0x48090000)
i386-freebsd4.9/memsize:
        libm.so.2 => /lib/libm.so.2 (0x48078000)
        libc.so.4 => /usr/lib/compat/libc.so.4 (0x48091000)

time i386-freebsd5.2/memsize 32
0.548u 1.073s 0:01.62 99.3%     25+33211k 0+0io 0pf+0w
time i386-freebsd4.9/memsize 32
0.009u 0.062s 0:00.07 85.7%     32+43957k 0+0io 0pf+0w

any insights?

danny