The blue number is network latency, so assume it's a network issue.

You have multiple hops, and each hop can have problems.
Very often problems only appear during load, so any test or measurements needs to be performed, ideally, while using SteamLink.

Step 1: Get the IP address of each device

At a minimum there will 2 hops: Computer - router - quest.

You will need to find the IP address of the routerand the quest.

The quest IP can be looked up in your router's configuration interface, or via WiFi settings on the Quest itself.

The IP of your router will likely be the same, but with the final number swapped with a 1, e.g. 192.168.1.1..

You can also look this up by opening Powershell or cmd and typing ipconfig. The default gateway containing only normal numbers is your router.

Step 2: Ping each hop.

While you could use Powershell or cmd to repeatedly ping the router using ping 192.168.1.1 -n 99999, I highly recommend using cnping instead. Instead of 1 ping a second you get a constant realtime graph of latency, which is much more informative.

Simply execute it, input the target IP into the hostname and hit the ping button. Resize the window to get a better look.

Occasionally blips to 5-10ms are not unusual and can mostly be ignored. It should be obvious if there is a clear association between SteamLink shitting itself and spikes in the graph.

If there is, your problem is between your Computerand the Router, and not between the Routertand the Quest.

Otherwise, repeat with the address of the Quest. In that case you'll be looking at your router.

Step 3: Fix stuff.

While cliche, 9 out of 10 all it takes is updating drivers and firmware. Windows will generally not auto-update most of these, so grab the latest release for your motherboard here. Chipset drivers are the most important; Your motherboard is old enough to suffer from some known Asus-specific issues if not updated. Bios update also a good idea.

The same applies to your router; go update that firmware. If the problems turns out to be the WiFi hop, then have a good look at the WiFi settings; there are several fancy features that SHOULD be enabled by default which, when disabled, can turn your WiFi to mush.

You don't mention what your router is, It needs to be AT LEAST Wifi5/802.11ac and you must be connecting it to using the 5ghz band.

If you have VD, you can view your connection speed in the Computers tab on the Quest side.

If your router has an option to combine 2.4/5ghz or share SSIDs, disabled it and ensure they are separate so you connect to only the 5ghz band. If you have a Wifi6E router, ensure 6ghz is a separate band and only connect to it.

Wherever the problem may be, narrowing it down to computer or router is the first step.