First snapshot:
on 5 GHz, you have raw signal of only -64 dB, not great. Noise is comfortably far away at -91 dB. you have made connection on channel 36, which has the best carrying distance, but also the most competition if you have neighbors. Your transmit rate is 300 M bits/sec.
If you had no completion from neighbors, you MIGHT be able to attain one step better, which would give you 360 instead of 300.
If you internet speed test says 2, that is not based on Hardware.
Poisoning Internet performance:
By far the easiest way to ruin performance and cause instability is to install ANY third-party speeder-uppers, Cleaners, Optimizers, Virus scanners third-party file Sync-ers such as DropBox, BackBlaze, OneDrive, or GoogleDrive, or a VPN that you installed yourself.
The idea that a third party, with no special knowledge of the inner workings of MacOS, can somehow find a simple way to protect your computer that is not already being done by MacOS itself suggests that the MacOS developers are somehow "holding out on you". That is absurd.
You should remove any and all other virus scanners, speeder uppers, optimizers, cleaners, App deleters or VPN packages you installed yourself, or anything of that ilk.
The current versions of MacOS have protections so good, there are currently no known Viruses that can SPONTANEOUSLY infect your Mac. Random ‘stuff’ is NEVER allowed to be Executed, so all your files do not need to be scanned, again and again. Only software from know developers is allowed to be considered for becoming Executable, and then only after you enter your Admin password to allow installation. Potentially-executable files are then scanned at first run by MacOS Gatekeeper, locked, and moved to the /Applications folder.
Effective defenses against malware and ot… - Apple Community
Effective defenses against malware and ot… - Apple Community