Launching Edge IE compatibility mode using LAN is slow

Question

Launching Edge IE compatibility mode using LAN is slow

John_1901 10

When I launch Microsoft Edge using a local network and turn on IE compatibility mode, it takes a while to launch smoothly. However, when I use the internet, it starts very quickly. I'd like to know how to fix this and get the LAN up as fast as the internet.

This problem occurs on all Windows systems.

Anonymous

2023-10-03T03:19:25.69+00:00
Hi @John_1901,

Based on your description, I think we still need some details to try and narrow down the cause of this issue. Could you provide these details below:

What are the Microsoft Edge version and Internet Explorer mode API version? Navigate to edge://compat/iediagnostic and you can check them.

Does this problem only occur at specific sites? Have you tried some public sites (such as google, bing), do they have the same problem？

Are there other configuration differences between LAN and Internet, such as the use of proxy? Or something else?

In non-IE mode, do these two network environments have the same problem when accessing the same site?
John_1901 10 Reputation points

2023-10-04T02:32:25.0133333+00:00
Hi @Anonymous ,

Microsoft Edge version is 117.0.2045.47, Internet Explorer mode API version is 19.

This problem only occurs in IE mode

Some LANs can connect to the Internet, and some LANs can't. This problem occurs when the local network cannot connect to the Internet.

In non-IE mode, Internet and Lan load the same website at normal speed. Only LAN loads websites extremely slowly when IE mode is enabled.

I'm sure IE mode starts slowly when using a LAN, but once connected to the internet, IE mode returns to normal.
Anonymous

2023-10-05T09:39:52.49+00:00

Hi @John_1901,

I'm wondering if this issue only occurs at a specific site (or is it an internal site)? Or does this problem occur on any site? If possible, could you provide more details? For example, is the operating system updated to the latest version? Since you mentioned that this problem occurs on a LAN that cannot connect to the Internet, I'm wondering if there is a difference in DNS resolution speed? You can try to check them.
John_1901 10 Reputation points

2023-10-06T02:10:17.8933333+00:00

Hi @Anonymous ，

To put it simply, when I open IE mode without an Internet connection, IE mode is extremely slow. However, when I connect to the internet, IE mode loads fine.

The websites I load in IE mode are all internal websites, so I can only use LAN and cannot connect to the Internet.

Where to check DNS resolution speed?
MotoX80 36,291 Reputation points

2023-10-06T18:39:23.4533333+00:00

Use Process Monitor and trace the activity.

https://learn.microsoft.com/en-us/sysinternals/downloads/procmon

Start by adding a filter for "Process name begins with iexplore".

Then recreate the problem. Press Ctrl+E to stop the capture. Then under the Tools menu select Network Summary. See if it lists any DNS servers or any external site names or IP addresses.

If you don't see anything out of the ordinary, then check the raw trace and see if you can find big gaps in the Time of Day column. That would indicate that the browser is waiting for something.

The next step would be to add a filter for "Process name begins with msedge" and see if one of those processes is doing something while you are waiting. Ctrl+E (or the magnifying glass icon) toggles the capture. I recommend clearing the trace between tests. Ctrl+X.

It sounds like your browser is trying to reach out to some internet site and has to wait until the call times out. You'll want to try to identify a site name or an IP address that you can trace back to something. Like web browser security software.

Come to think of it, have you tried temporarily stopping Windows Defender or any 3rd party antivirus software and see if that makes a difference?
John_1901 10 Reputation points

2023-11-08T08:22:00.4433333+00:00

Hi @MotoX80 ,

After observation, we found that all processes are connected to these IPs.

Since the computer is within a local network, is this the reason for the slow loading speed of IE mode?

It is speculated that IE mode requires connecting to Microsoft. Is there a way to cancel verification?
Anonymous

2023-11-08T08:49:22.8033333+00:00

Hi @John_1901,

When on an internal network, this problem may occur if your webapp uses ActiveX controls and is running Edge IE compatibility mode. You can check if it is the same situation and try disabling ActiveX controls to see if it works for you.
John_1901 10 Reputation points

2023-11-08T09:02:53.4+00:00

Hi @Anonymous ,

I disabled all ActiveX in Internet options.

It still takes a long time to load when connecting to the website
MotoX80 36,291 Reputation points

2023-11-09T00:45:44.6766667+00:00
What do you have set for the home page? I have not changed from the Win11 default of Msn.com, and it loads a bunch of internet based content. I haven't tested this, but I would expect that to take a while for everything to timeout if I'm not connected to the internet.

Close all instances/tabs of Msedge. Open a command prompt and run this command.

start msedge "about:blank"

You should get a blank page. How long does that take to load?

Then select "Reload in Internet Explorer mode". How long does that take? Do you still see it trying to connect to a bunch of internet sites?
John_1901 10 Reputation points

2023-11-09T04:05:51.14+00:00

Hi @MotoX80 ,

Our computers are all running Win7 109.0.1518.140 version of edge. We cannot enable and load IE mode manually. I applied this functionality using Enterprise Mode Site Manifest.
MotoX80 36,291 Reputation points

2023-11-09T13:16:09.6266667+00:00

I am unable to recreate your environment.

What are you using for a home page? Does start msedge "about:blank" work? Can you set the home page to "about:blank"?
John_1901 10 Reputation points

2023-11-10T00:59:08.2933333+00:00

Hi @MotoX80 ,

Yes, I set the homepage to about:blank and then connected to the internal webpage. IE mode still loads very slowly.

I doubt IE mode talks to Microsoft or any IP when loading since it loads smoothly using the internet! It won't take 30 seconds to 1 minute to load like LAN!

In addition to Win7, this situation will occur in Win10 and Win11. It has been confirmed that it is not because the computer is old and slow.
MotoX80 36,291 Reputation points

2023-11-10T02:12:51.1533333+00:00

I'm sorry, but I have no way of knowing what web sites your browser is trying to access. My reply about using Process Monitor would be my best suggestion to try to understand what MSEdge is doing when it loads slow. Is it doing file I/O, is it waiting on an HTTP request, I don't know, you will need to analyze the trace.
MotoX80 36,291 Reputation points

2023-11-10T17:57:34.4833333+00:00

I took some of the IP's that you have listed in that image and did a whois lookup. While that reports that Microsoft owns the IP range, I did an nslookup on the IP and no names were found. Then I tried using curl to see what page I got back.

http://13.107.246.73/

Your image shows https connections which won't let me access the page because I don't know the web site name that matches the certificate. Some like the one above have http exposed where I can see that this is Azure related.

While Microsoft may be the host provider, they do not look like they are Microsoft Windows related sites. They are Azure or Azure content distribution addresses for customer sites. We would need to know what https://name your pc is trying to access.

Try running an "ipconfig /displaydns" command to see if any names match the listed addresses.
John_1901 10 Reputation points

2023-11-13T03:38:25.7933333+00:00

Hi @MotoX80 ,

Later, I found this paragraph from the inter-process compiler: deploy.static.akamaitechnologies

I tried enabling this IP in the firewall settings and found that IE mode loaded just as fast as connecting to the internet!

But I don’t know the reason at the moment. Some computers have the effect, while others don’t. The loading speed of IE mode is just as slow! !

If my method is correct, do I need to start other IPs or services for other computers to take effect?
MotoX80 36,291 Reputation points

2023-11-13T16:11:52.3066667+00:00

I have no way to know what your browser/PC is doing.

I tried to recreate a setup that is similar to the environment that you've described.

On my laptop, I have a Win10 VM and I configured it to have a host only network. This blocks internet access for the VM

Then on the VM, I set it to open my laptop's home page in IE mode.

From a command prompt I did a "start msedge http://blackhole".

I do not see any HTTP traffic other than the requested page. I do see one netbios name lookup but that's it. It took around 9 seconds to load that page. The VM does not have much memory.

If your pc's are reaching out to other internet sites, then you must have something else installed that is causing that activity. What are you using for antivirus? Defender or a 3rd party product? Does it have a browser plugin that might be trying to check on something?

From my experience, you need to identify what sites your browser is trying to load that is causing your delay. From the http://UrlAddress you should be able to track that back to some software or setting.

If you can't capture the activity with Process Monitor, then try hitting F12 to launch the developer tools and check the network tab to see if that shows anything.

It's quite possible that the internal web page has references or javascripts that reach out to internet sites.

Your answer

Anonymous

2023-10-03T03:19:25.69+00:00

Hi @John_1901,

Based on your description, I think we still need some details to try and narrow down the cause of this issue. Could you provide these details below:

What are the Microsoft Edge version and Internet Explorer mode API version? Navigate to edge://compat/iediagnostic and you can check them.

Does this problem only occur at specific sites? Have you tried some public sites (such as google, bing), do they have the same problem？

Are there other configuration differences between LAN and Internet, such as the use of proxy? Or something else?

In non-IE mode, do these two network environments have the same problem when accessing the same site?
John_1901 10 Reputation points

2023-10-04T02:32:25.0133333+00:00

Hi @Anonymous ,

Microsoft Edge version is 117.0.2045.47, Internet Explorer mode API version is 19.

This problem only occurs in IE mode

Some LANs can connect to the Internet, and some LANs can't. This problem occurs when the local network cannot connect to the Internet.

In non-IE mode, Internet and Lan load the same website at normal speed. Only LAN loads websites extremely slowly when IE mode is enabled.

I'm sure IE mode starts slowly when using a LAN, but once connected to the internet, IE mode returns to normal.
Anonymous

2023-10-05T09:39:52.49+00:00

Hi @John_1901,

I'm wondering if this issue only occurs at a specific site (or is it an internal site)? Or does this problem occur on any site? If possible, could you provide more details? For example, is the operating system updated to the latest version? Since you mentioned that this problem occurs on a LAN that cannot connect to the Internet, I'm wondering if there is a difference in DNS resolution speed? You can try to check them.
John_1901 10 Reputation points

2023-10-06T02:10:17.8933333+00:00

Hi @Anonymous ，

To put it simply, when I open IE mode without an Internet connection, IE mode is extremely slow. However, when I connect to the internet, IE mode loads fine.

The websites I load in IE mode are all internal websites, so I can only use LAN and cannot connect to the Internet.

Where to check DNS resolution speed?
MotoX80 36,291 Reputation points

2023-10-06T18:39:23.4533333+00:00

Use Process Monitor and trace the activity.

https://learn.microsoft.com/en-us/sysinternals/downloads/procmon

Start by adding a filter for "Process name begins with iexplore".

Then recreate the problem. Press Ctrl+E to stop the capture. Then under the Tools menu select Network Summary. See if it lists any DNS servers or any external site names or IP addresses.

If you don't see anything out of the ordinary, then check the raw trace and see if you can find big gaps in the Time of Day column. That would indicate that the browser is waiting for something.

The next step would be to add a filter for "Process name begins with msedge" and see if one of those processes is doing something while you are waiting. Ctrl+E (or the magnifying glass icon) toggles the capture. I recommend clearing the trace between tests. Ctrl+X.

It sounds like your browser is trying to reach out to some internet site and has to wait until the call times out. You'll want to try to identify a site name or an IP address that you can trace back to something. Like web browser security software.

Come to think of it, have you tried temporarily stopping Windows Defender or any 3rd party antivirus software and see if that makes a difference?
John_1901 10 Reputation points

2023-11-08T08:22:00.4433333+00:00

Hi @MotoX80 ,

After observation, we found that all processes are connected to these IPs.

Since the computer is within a local network, is this the reason for the slow loading speed of IE mode?

It is speculated that IE mode requires connecting to Microsoft. Is there a way to cancel verification?
Anonymous

2023-11-08T08:49:22.8033333+00:00

Hi @John_1901,

When on an internal network, this problem may occur if your webapp uses ActiveX controls and is running Edge IE compatibility mode. You can check if it is the same situation and try disabling ActiveX controls to see if it works for you.
John_1901 10 Reputation points

2023-11-08T09:02:53.4+00:00

Hi @Anonymous ,

I disabled all ActiveX in Internet options.

It still takes a long time to load when connecting to the website
MotoX80 36,291 Reputation points

2023-11-09T00:45:44.6766667+00:00

What do you have set for the home page? I have not changed from the Win11 default of Msn.com, and it loads a bunch of internet based content. I haven't tested this, but I would expect that to take a while for everything to timeout if I'm not connected to the internet.

Close all instances/tabs of Msedge. Open a command prompt and run this command.

start msedge "about:blank"

You should get a blank page. How long does that take to load?

Then select "Reload in Internet Explorer mode". How long does that take? Do you still see it trying to connect to a bunch of internet sites?
John_1901 10 Reputation points

2023-11-09T04:05:51.14+00:00

Hi @MotoX80 ,

Our computers are all running Win7 109.0.1518.140 version of edge. We cannot enable and load IE mode manually. I applied this functionality using Enterprise Mode Site Manifest.
MotoX80 36,291 Reputation points

2023-11-09T13:16:09.6266667+00:00

I am unable to recreate your environment.

What are you using for a home page? Does start msedge "about:blank" work? Can you set the home page to "about:blank"?
John_1901 10 Reputation points

2023-11-10T00:59:08.2933333+00:00

Hi @MotoX80 ,

Yes, I set the homepage to about:blank and then connected to the internal webpage. IE mode still loads very slowly.

I doubt IE mode talks to Microsoft or any IP when loading since it loads smoothly using the internet! It won't take 30 seconds to 1 minute to load like LAN!

In addition to Win7, this situation will occur in Win10 and Win11. It has been confirmed that it is not because the computer is old and slow.
MotoX80 36,291 Reputation points

2023-11-10T02:12:51.1533333+00:00

I'm sorry, but I have no way of knowing what web sites your browser is trying to access. My reply about using Process Monitor would be my best suggestion to try to understand what MSEdge is doing when it loads slow. Is it doing file I/O, is it waiting on an HTTP request, I don't know, you will need to analyze the trace.
MotoX80 36,291 Reputation points

2023-11-10T17:57:34.4833333+00:00

I took some of the IP's that you have listed in that image and did a whois lookup. While that reports that Microsoft owns the IP range, I did an nslookup on the IP and no names were found. Then I tried using curl to see what page I got back.

http://13.107.246.73/

Your image shows https connections which won't let me access the page because I don't know the web site name that matches the certificate. Some like the one above have http exposed where I can see that this is Azure related.

While Microsoft may be the host provider, they do not look like they are Microsoft Windows related sites. They are Azure or Azure content distribution addresses for customer sites. We would need to know what https://name your pc is trying to access.

Try running an "ipconfig /displaydns" command to see if any names match the listed addresses.
John_1901 10 Reputation points

2023-11-13T03:38:25.7933333+00:00

Hi @MotoX80 ,

Later, I found this paragraph from the inter-process compiler: deploy.static.akamaitechnologies

I tried enabling this IP in the firewall settings and found that IE mode loaded just as fast as connecting to the internet!

But I don’t know the reason at the moment. Some computers have the effect, while others don’t. The loading speed of IE mode is just as slow! !

If my method is correct, do I need to start other IPs or services for other computers to take effect?
MotoX80 36,291 Reputation points

2023-11-13T16:11:52.3066667+00:00

I have no way to know what your browser/PC is doing.

I tried to recreate a setup that is similar to the environment that you've described.

On my laptop, I have a Win10 VM and I configured it to have a host only network. This blocks internet access for the VM

Then on the VM, I set it to open my laptop's home page in IE mode.

From a command prompt I did a "start msedge http://blackhole".

I do not see any HTTP traffic other than the requested page. I do see one netbios name lookup but that's it. It took around 9 seconds to load that page. The VM does not have much memory.

If your pc's are reaching out to other internet sites, then you must have something else installed that is causing that activity. What are you using for antivirus? Defender or a 3rd party product? Does it have a browser plugin that might be trying to check on something?

From my experience, you need to identify what sites your browser is trying to load that is causing your delay. From the http://UrlAddress you should be able to track that back to some software or setting.

If you can't capture the activity with Process Monitor, then try hitting F12 to launch the developer tools and check the network tab to see if that shows anything.

It's quite possible that the internal web page has references or javascripts that reach out to internet sites.

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Launching Edge IE compatibility mode using LAN is slow

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