If the process outputs a lot of data on stdout this can be quite slow, since the bytestring is regenerated each time. Use a bytearray instead. Signed-off-by: Simon Glass <sjg at chromium.org> --- tools/patman/cros_subprocess.py | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) Applied to u-boot-dm, thanks!