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Slow Internet Explorer performance, "start" time very long

Windows 7 Professional SP1, and Internet Explorer 10, on various machines including a virtual machine in Hyper-V. The computers are in a Windows Server 2012 R2 domain environment

I'm experiencing weird slow performance in Internet Explorer 10.

Intermittently, when I type an address into the address bar, e.g. www.hotmail.com, it sits there with the circle spinning, saying "Waiting for hotmail.com", for about 30-40 seconds, then loads the page.

It's not a network issue. The Internet and local network infrastructure is fast and reliable, and Google Chrome works fine
It's not a spyware/virus/local PC issue. The problem happens on ALL computers, even recently re-imaged PCs, there is no proxy settings, no DPI happening on the firewall
It's not an issue with a specific website. It happens on ALL websites, including highly available and fast websites like Gmail.com or Google.com
It happens only in Internet Explorer. Google Chrome fast as usual.

I went into the F12 Debugging Tools and ran a Network Profiler, and it comes back with some interesting results. See the pictures below:

IE10 Network Profile Capture Results
You can see how the actual request / response is almost instantaneous. The "start" time is enormous - 10 seconds or more. Most of the records in the Network Profile are like that.

This usually only happens a couple of times, after that the "Start" time drops down to half a second, and pages load much faster. But every once in a while a webpage will take over a minute to load, and users are constantly complaining that the "Internet is slow".

What is going on? What does the "Start" time mean in IE?
1 Solution
Here are some troubleshooting steps that you can try to resolve this problem.

Open Internet Explorer in No Add-on mode and then check if this fixes the issue.
Follow the steps to open Internet Explorer in No Add-on Mode.
a. Press “Windows Key + R”.
b. Type “iexplore –extoff” without quotes in the Run Window and hit enter.
c. Now the Internet Explorer will open in No Add-on mode.

If that don't work let’s start your computer in safe mode with networking and check. Refer this link to start the computer in safe mode.

If it works fine in safe mode with networking, let’s perform clean boot.

Clean boot will help us identify if any third party applications or startup items are causing the issue.
To do this, follow steps from this link:
NOTE: After checking the functionality in clean boot, follow the suggestions under “How to reset the computer to start as usual after troubleshooting with clean boot”.

Also run Internet Explorer performance troubleshooter and check with the issue.
a)    Press ‘Windows + W’ key and type ‘Troubleshooting’ in the search and press enter.
b)    Click on ‘View All’ in the left pane.
c)    Select ‘Internet Explorer Performance’ and click ‘Next’ to run the troubleshooter.
Daniel KlineSr. SharePoint DeveloperCommented:
This may be as simple as a misconfiguration of your DNS server on the client.  Are you clients set up to get DNS servers  from DHCP services?  If so, are all of the DNS servers responding quickly?  It may be that one of the DNS servers is having problems or has been decommissioned.  Another possibility is that there is a misconfiguration of the firewall for the https services.

Both of the 300 HTTP responses indicate a redirect due to move.  Perhaps the firewall does not like to route redirects.
Frosty555Author Commented:
It was a DNS issue

I know this has been a long time ago but we are facing the same problem with IE11 on a server 2012r2.
Can you be a little more specific on how you solved this issue?

Daniel KlineSr. SharePoint DeveloperCommented:
First, I notice that you are talking about a server.  In most cases, the IP address is static (specifically set up in the adapter configuration for a specific value) as opposed to get their address and DNS settings from the DHCP server.

Step 1:  Run 'ipconfig /all' (no quotes)  from a command window and it will show the values for the adapter.  Below is an example of how that might look:
Ethernet adapter:
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft Hyper-V Network Adapter
   Physical Address. . . . . . . . . : 00-15-5D-00-EE-04
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::2495:df76:c098:9670%12(Preferred)
   IPv4 Address. . . . . . . . . . . :
   Subnet Mask . . . . . . . . . . . :
   Default Gateway . . . . . . . . . :
   DHCPv6 IAID . . . . . . . . . . . : 201332061
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-80-39-F5-00-15-5D-00-EE-04
   DNS Servers . . . . . . . . . . . :
   NetBIOS over Tcpip. . . . . . . . : Enabled.

I'm assuming from your request that you can see other devices on your network and that the IP address on the adapter is valid for your environment.
You can compare this network configuration with other machines on your network to determine if there was a typo during configuration.

Unless you have no internal DNS server, both the DNS and the Gateway should be on the same network segment as your server based on its IP and Network mask.


Use the command window to ping the IP addresses of both the DNS and gateway devices  (e.g. ping  If everything is configured correctly, these should respond quickly with no dropped packets.

Pinging with 32 bytes of data:
Reply from bytes=32 time=1ms TTL=64
Reply from bytes=32 time=1ms TTL=64
Reply from bytes=32 time=2ms TTL=64
Reply from bytes=32 time=8ms TTL=64

Ping statistics for
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 8ms, Average = 3ms

Step 3:

In the same command window, type 'nslookup google.com' (or your favorite site). It should respond very quickly with the registered IP address(es) for the domain.

Non-authoritative answer:
Name:    google.com
Addresses:  2607:f8b0:4002:c03::64

If these steps completed successfully, then it is safe to say that DNS configuration is not your issue.  If not, post your results for analysis.

Occasionally, applications, scumware and spyware will add entries into the C;\windows\system32\drivers\etc\hosts file.  An admin should be able to edit this file and remove any entries that are not required for operation.  You could, again, check the configuration with a working machine in your environment.

If DNS is not the issue, then I would follow jjmekkattil 's instructions and try to determine what add-ons or client applications are interfering with IE.  If you need help with that step, post a list of the IE add-ons on the server.  If jjmekkattil 's instructions work, based on the specific step, you may need to re-enable the  services one by one until the browser starts failing to identify the specific application or add-on that is the culprit.

Good luck ... in most cases the solution is as simple as a configuration typo.
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