winefps.sh

#!/bin/sh

if [ $# -eq 0 ] || [ "$1" = "-h" ]; then
	cat<<EOF
Usage: ${0##*/} WIN_EXE PARAMS"

Run Wine application while displaying FPS onscreen.
EOF
	exit
fi

if ! command -v osd_cat >/dev/null 2>&1; then
	echo >&2 "osd_cat not found in path."
	exit 1
fi

## The unbuffered option is -u on GNU and OpenBSD, -l on others.
OPT_UNBUF=-l
case "$(uname)" in
Linux|OpenBSD) OPT_UNBUF=-u ;;
esac

WINEDEBUG=fps wine "$@" 2>&1 | tee /dev/stderr | \
	sed $OPT_UNBUF -n '/^trace:fps:/{s/.* \([^ ]*\)fps/\1/;p}' | \
	osd_cat -l1 -f  "-*-*-*-*-*-*-32-*-*-*-*-*-*-*" -O1 -c "yellow"

A little critique, not to blame someone, but to help others

1. Won't work if you run wine under another user, not the user who was logged in first and started the X session, because the second user doesn't have rights to the /dev/stderr of the first user. Here is the link to the info source.
2. The sed command is a bit different in my case (or maybe it's a wine's log system change). The part trace:fps... is not at the beginning of each line, but right after some number. My log string looks like this: 0024:trace:fps:wglSwapBuffers @ approx 55.30fps, total 38.05fps.