One thing is your router-modem combo shoud be shut down unplugged 1 x a weak l for the cache gets built up,, turn off unplug for one minute ,then turn back on a tech told me this it refreshes and empties the buffer giving it faster load times
I highly recommend buying a much higher grade router setup
I bought a Motorola 8702 combo router- modem on Amazon it has wifi 5 but has docsis 3.1 , most are older3.0, much bigger processor much faster and much larger buffer easy to setup this works the majority of companies , around $270.just call tech support they ask for a Mac # within 10 minutes up and running ,for a clear wifi or streaming upgrade the rougher is 4 amp buy a LPS power supply Digital is not grounded small green computer has a decent one $299 and a decent power cords nice upgrade ,the stock $5 wall wart just add more noise .