Server response time logged in log file is greater than TTFB shown in browser

#1
Hi,
We need to log external application i.e lsphp response time. So we are using the following log format.
Apache config:
logFormat %{Host}i %h %t %>s %O %D \"%r\" %{User-agent}i
Where %D is reponse time in miroseconds.

res.png
Here response time is 94221 micro seconds.
So it is 94.22 milli seconds.

ttfb.png

But in browser it shows 80.78 ms.
So which one is showing wrong data or which one we have to consider
 
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