What Can Cause Laggy Connectivity With Citrix (Remote Access Software)? Tried all!

[genkuru]

I purchased a brand new laptop HP Envy, i7, 13th Gen, 32GB. It's been having issues with Internet connectivity for months. Speed test shows great speed up to 400 Mbs and only sometimes as low as 3 Mbs. Most of the time speed test starts immediately, but sometimes it is pending for 5-8 seconds since the laptop "cannot connect to a server". But even that, websites download pretty fast, and streaming video is fine. Not an issue when I use it for personal purposes. The issue arises when using the Citrix app for working remotely. The connection appears to be laggy and freezes often for a few seconds. Using Excel is just unbearable since it freezes for 2-5 seconds after each click, sometimes up to 20 seconds. Often I have to reconnect to Citrix. Unreal to work smoothly. What I have tried so far:

1. A similar HP Envy laptop of the prior generation does not have this issue and demonstrates high-speed connectivity with Citrix the moment I switch to it from my new laptop every single time.
2. No other device in the house has this issue with this Wi-Fi network
3. Connected my laptop to my phone via hotspot. The phone speed test is great, laptop speed test is the same bad.
4. Worked right next to the router – the same bad.
5. Used this laptop with a different wi-fi network at a friend’s house for 2 weeks in a row. Better but the same issue persists.
6. Filed a ticket with HP Support. After running all possible checks, they didn’t find anything and suggested reinstalling Windows.
7. I reinstalled Windows and guess what. The issue stands!

If you have ever encountered the same issue or have ideas about what could cause it and how to fix it, I would be very grateful. Thank you.

[genkuru]

This HP community ***. - no replies for any question for years.