MR90 - Slow WiFi Speeds

A couple things. 

1. you don't say what band you're testing on. For 2.4ghz, 100mbps is pretty darned fast. Not so much for 5/6ghz. Its also important what device you're testing with
2. you don't say if you're testing on a wired satellite, one of the wireless ones, the router, or even if the wireless satellites are daisy chained (will drops speeds and increase latency)
3. You DO say what wired speeds you're getting. But you're not specific to if you tested the router, wired satellite, wireless satellites, etc.  key details. 

What I'd recommend. Start with a laptop with ethernet. Test each satellite and write down your speeds. Thats critical to know. If one satellite has a bad backhaul connection and for some reason most devices connect to it, they'll be slow. figure out how each is performing first. 

Then troubleshoot wireless. Remember that different bands will have different speeds. 2.4ghz is slow. 5 and 6ghz are much faster but don't broadcast as far (especially the 6ghz)

And the wireless satellites will perform slower than the wired one because they don't have a dedicated backhaul. And if one of them is daisy chained (router---->satellite---->satellite), it'll be even slower still. 

So a few things to check, details to iron out, and some troubleshooting to do