php - Why TTFB on IE is slower than Chrome / Firefox like 10 times? -

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i have crazy couple day, same domain, same page, load on chrome / firefox max 4 seconds. ie, ttfb 12 seconds:

http://www.webpagetest.org/result/150718_7g_10s/ http://www.webpagetest.org/result/150718_z5_148/

url is: http://appraisals.wintrustmortgage.com/tandem/login/?

anyone can give me recommend ?

what ttfb (time first byte) includes

  • time server spends processing request after received
  • time server spends sending first byte of response client

what ttfb not include

  • time spent negotiating domain name resolution (i.e. dns)
  • time client takes connect server
  • time spent negotiating ssl connection
  • time spent between end points sending packets (i.e. network latency)
  • time server spends receiving request
  • time spent consuming response client (i.e. client read time)
  • time client spends parsing/rendering/executing response or making/waiting-on subsequent requests to/from server

differences between chrome/firefox , ie

ie not measure ttfb. measures ttlb (time last byte), different. please see using windows internet explorer developer tools network capture details.

response - offset value taken when response first received server. duration time between start time , when last byte received server.

the difference outlined in chrome's detailed break down of network timed events

enter image description here

as opposed ie's horrid implementation of this...

enter image description here

simply put, browser has no bearing on ttfb. ie's developer tools less comprehensive , useful in regard.

the blue/teal-ish block, 1.74 seconds non-inclusive, represents time spent waiting on response data down last byte. means network latency can effect measurement. know, ttfb still within ~300 milliseconds , remainder of ~1.4 seconds spent downloading rest of response.

i hope clarifies misconception here.


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