Gaps in internet explorer tests
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05-22-2015, 01:39 AM
Post: #1
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Gaps in internet explorer tests
Hi,
I see gaps in waterfalls with tests in internet explorer I don't understand: http://www.webpagetest.org/result/150521...1/details/ If these gaps between DNS lookup and connection initialization or between connection/ssl-handshake and ttfb would appear in follow-up resource requests I would assume the browser performs DNS pre-resolution and/or TCP pre-connection. But in initial (HTML-)request? I don't understand these gaps. Is that a bug in rendering of wpt waterfall and dns lookup or connection initialization last longer than bars in waterfall chart look like? Or is it a problem in wpt or browser software on agent machines and browser is busy in these gaps? But there is nothing eye-catching in cpu utilization... Best regards, Nils |
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05-22-2015, 05:04 AM
Post: #2
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RE: Gaps in internet explorer tests
You can capture a tcpdump and look at the packets to verify but last time I did that for IE 11 the gaps were real and I have no idea what IE is doing in that time.
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05-24-2015, 07:48 AM
Post: #3
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RE: Gaps in internet explorer tests
IE is... well IE. It is often derided for doing things it shouldn't and it is pretty much a law unto itself.
My best guess was that there were other processes being kicked off in the background (looking at the CPU utilisation graphs). I specialise in speeding up websites. Want a free quote? Just give us a private message and we'll see what we can do for you. |
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