Comment 19 for bug 854986

Let's attack this one as being the slightly easy of the two, and hopefully should give some insight into the pair.

Can we get an strace of X starting along with a perf report? Something like strace -t -o x.strace X -ac
perf record -f -g -a X -ac && perf report | cat > x.perf

And see if we capture any obvious clues.