redirect - slow update after pipe, stout, stderr redirection and saving file at the same time -

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i'm saving output of command after redirecting stdout, stderr , passing through pipe. things seem working fine i'm noticing delay in bash screen update <= 37 seconds.

the same delay see when checking output file "tail -f output-ping.txt". i've never seen such delay earlier ping nor think happening cause of tee. because of numerous redirections being performed? thoughts! thanks.

ping google.com 2>&1 | awk '{ print strftime("%y-%m-%d %h:%m:%s"), $0; }' | tee -a output-ping.txt

i tried myself , needed flush awk stream, dropped str line, think there no problem there

ping google.com 2>&1 | awk '{ print $0, fflush() }' | tee -a pepe.txt

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