Before I spend a lot of time going to all the links amd comparing all the machines you listed, which is beyond the scope of a volunteer, with the money you have to spend I would go to www.tigerdirect.com
Can you be more elaborate on what is meant by "very poor"? Do you mean things are simply too quiet? Or something else? Can you provide more information about exactly what you're playing back with - like
Ernie, Thanks for writing! I've not fiddled with this myself, but Apple has a short tech note on it: https://support.apple.com/en-us/HT202828 "Change the font size on your iPhone, iPad, and iPod touch
There is no connection to firewall or adblocks. You can surely use one, but the behavior you described goes beyond typical web ads annoyance. Adblock: Try Ublock Origin (Download from Chrome store)
Hi Yolande This is strange. Do you have many files you need on your iMac? Did you backup?