For me I believe the issue is when you have 2 instant on switches that are both different model being managed by the cloud portal. To get back the full speed i had to change my 8 port switches to local mode only which then solved the issue for me.
My recommendation for people if you have 2 different models switch 1 of the models to local mode only if you want your full speed back. (at least thats what my further testing proves to me)
I have a method for limiting 90Mbps
I will give two examples for which the method worked:
Apple TV: connected via WiFi, run the test, e.g. Speedtest Ookla (there is an AppStore), in my case it was 90Mbps.
Power off the Apple TV and connect the wired to the switch (1930), run the test again, in my case it was 498/29 Mbps (I have 500/30 internet access). You need to do a dozen test (10-20). After that we disconnect the wired from the switch and Apple TV switches to WiFi.
We restart Speedtest and ..... I had 480/25Mbps
I did the same with the iMac on which I also had a 90Mbps limit!
I turned off the WiFi connected to the switch 1930 via the wired. I did some speed tests and worked like this for about 1 hour (results - 500/30, 498/28, all ok). Later I disconnected the cable and turned on WiFi. And … I ran the test and the results were super 498/25,500/30 via WiFi without 90Mbps limit.
It's a bit funny but it has been working for two days, I have no limit on these devices. I still have a problem with the IPhone and IPad because I can't connect them via the wired .
Test it may also work for you.
MAC and IP were different but I think ARUBA is using OS ID or Service ID to assign subnet. As is the case with AirGroup assignment in higher ARUBA systems.
I think this is at the switch. I didn't notice until now but it affects all my vmware servers.
They are hardwired at the switch, both windows and Linux vm's affected exactly the same. Limited to 90mbps when anything with a 100mbps connection is negotiated at the switch on the same vlan. I've had to go as creating a new vlan for the 100mb devices to keep them away from the rest.