Comment by soneil

I tried similar. Each command looped 5 times, ignore the best and worst times, and average the mean three.

    journalctl >/tmp/all.log  0m59.763s
    journalctl | grep -c sshd 0m57.767s  (otherwise >all is the only example encumbered by write speeds)
    wc -l /tmp/all.log        0m0.336s
    grep -c sshd /tmp/all.log 0m1.776s