Thank you all for the tips - see the (ugly) solution below.
Unfortunately installing package from http://hpux.connect.org.uk is not an
option - and as it turned out (see below) it wouldn't help anyway.
I tried the other tip to compile vim for profiling but I got strange errors
which nor I nor Google had any idea what to do with:
gcc -c -I. -Iproto -DHAVE_CONFIG_H -g -O2 -D_FORTIFY_SOURCE=1 -pg
-g -DWE_ARE_PROFILING -o objects/eval.o eval.c
/var/tmp//ccVmJ1Zu.s: Assembler messages:
/var/tmp//ccVmJ1Zu.s:107302: Error: `mov' does not fit into MMB template
*** Error exit code 1
Finally I decided to try to track down the slowness by commenting out parts in
the source code and try when it gets fast.
Shortly, it turned out that the regular check for user interrupt (ctrl-C)
during text search is extremely slow on this HPUX box for some reason.
I didn't go further and just hacked that line_breakcheck() checks for user
interruption after 10000 calls instead of the default 32. Not really nice, but
works.
misc1.c:
// by balee >> not that often please
#undef BREAKCHECK_SKIP
#define BREAKCHECK_SKIP 5000
// <<
static int breakcheck_count = 0;
void
line_breakcheck()
{
if (++breakcheck_count >= BREAKCHECK_SKIP)
{
breakcheck_count = 0;
ui_breakcheck();
}
}
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