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one user is experiencing extreme latency with particular websites

pkromer
pkromer used Ask the Experts™
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One of our staff users  is having an issue with any website on any of our 3 dedicated Pair networks servers being unusable slow, almost to non-functionality.... none of the rest of us are seeing any issue whatsoever. She says all other websites load fine... its just websites on our 3 web servers that are very very slow, almost unusable. Have you ever heard of something like that? She uses a Mac, has emptied all cache, rebooted, speed tests, the works, everything is fine for her except the sites she visits on our 3 web servers. We are not all at the same IP... she works from home, like a few of us do, and shes the only one with an issue. Pair says they see nothing wrong.
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Top Expert 2016

Commented:
do you have any other mac users experiencing this problem oris she the only mac user?

Author

Commented:
she is the only mac user
Scott FellDeveloper & EE Moderator
Fellow 2018
Most Valuable Expert 2013

Commented:
Does she get the same slow speed using a different browser like Chrome?

Have her run a ping and tracert to your domain.
David FavorFractional CTO
Distinguished Expert 2018

Commented:
This almost sounds like the DNS this user is using (DNS resolver) is always timing out, then falling over to another forwarder.

If I were having this problem, I'd start by using command line tools like dig + curl to determine if the problem was browser related or something else.

Suggestion: Publish URLs of all 3x sites for testing.
nociSoftware Engineer
Distinguished Expert 2018

Commented:
Another issue maybe on your end... If that user has NO reverse lookup and you try to resolve the IP address to a name for logging, access control etc.) then there will be a delay regularly depending on DNS resolving speed.
If those allways run into timeout you will loose about 30 seconds per configured nameserver.
Developer & EE Moderator
Fellow 2018
Most Valuable Expert 2013
Commented:
For DNS, try either using cloudflare or google

https://developers.cloudflare.com/1.1.1.1/setting-up-1.1.1.1/mac/
Step 1: Go to System Preferences. You can find it by pressing Command+Space on your Mac and typing System Preferences.

Step 2: Click on the icon called Network.

Step 3: Click Advanced.

Step 4: Select the DNS tab. Remove any IP addresses that may be already listed and in their place add:

1.1.1.1
1.0.0.1
2606:4700:4700::1111
2606:4700:4700::1001
Step 5: Click OK.

Step 6: Click Apply.


Google's will be
8.8.8.8
8.8.4.4
2001:4860:4860::8888
2001:4860:4860::8844

However, if it is a laptop and the issue persists from multiple locations, the next thing to check is the host file. Make sure your site is pointing to the right ip https://www.techjunkie.com/edit-hosts-file-mac-os-x/

It  has been a few years since I have used mac osx, but I do remember having these types of issue. Just changing an IP of a domain would take a long time to go through on the mac vs quickly on windows.

Author

Commented:
She said she had somebody check her hosts file and after that it was ok. Not real sure what that person did but it had to do with hosts file. So, thanks everybody.
Scott FellDeveloper & EE Moderator
Fellow 2018
Most Valuable Expert 2013

Commented:
Yea, that is a mac thing from what  remember. Glad it is resolved.