The losses appear to be mainly request timed out but also I get several Destination net unreachable from a different IP (192.168.10.253) how does that happen? EDIT: this is the default address of the extender which makes sense.
The requests that did work have an average of 6ms. I assume this isn't too bad.
I'm going to bypass different pieces of equipment to find the culprit, but my money is on the cheap extender I am using.
It sounds like the extender is the issue from what you've said.
If you had a cable direct from the PC you should get zero packet loss and an average ping time of less than or equal to 1ms