This board is just fellow eBay users, not able to fix eBay.

However, I've just checked My eBay and messages on Firefox & Chrome, both load quickly and work quickly, so eBay seems ok for me here.

You could have an internet problem? How do you connect, what speed?

You could look at

Pop-ups and other annoyances on Windows computers.

pinned at the top of this board and run thru the steps as you may have some infection.