This isn’t the answer to the question, but photopea.com is pretty much an exact clone of Photoshop that is completely online and free.

What ISP do you have and what country are you in? I have Comcast in the US and do not have this issue even though they are a big and shitty ISP (I even use their modem, but I do have my own router which I HIGHLY suggest).

This is exciting, regardless of what it could be!