Bash script parallel tasks and command to wait untill complete?

Hello,

im having bash script with

while ***
command1 &&
command2 &&
command3 &&
done

i want to ask how i can prevent overloading server, by waiting untill all commands complete? any low resources intensive command like "wait" - i dont know if exist?

From the man page:

If you want to wait for all the 3 processes and also check their end status

command1 &
C1_PID="$!"
command2 &
C2_PID="$!"
command3 &
C3_PID="$!"

wait ${C1_PID}
RC1="$?"
wait ${C2_PID}
RC2="$?"
wait ${C3_PID}
RC3="$?"