seq 20 | pv -l -s 20 | while read line; do sleep 1; done
  20 0:00:00 [13.8k/s] [=====================================>] 100%

#! /bin/bash
limit=10
seq 20 |
  pv -l -s 20 |
  while read num
do
  sleep 1
  if [ $num -gt $limit ]
  then
    echo $num
  fi
done

seq 20 | while read line; do sleep 1; echo ${line}; done | pv -l -s 20 > /dev/null