A new workbook saved to a sharepoint is excruciatingly sluggish

I create a book1.xlsx and it's blank, save it to my desktop and it works as expected. Changing cells is instantaneous. Typing in a cell is instantaneous. Hitting enter to finish editing that cell is also instantaneous.

Then I save it to our organizations SharePoint, which happens to be overseas. Suddenly, every action is met with nearly half second lag. I can start typing in a cell at a normal speed and it lags, characters show up in chunks as I type. Even single-clicking on different cells is met with lag. This is in the desktop excel, not web based.

Why is this happening? Every online resource tells me I have too much data, too complex of a formula, but there is none of that in here. When I open an excel file from a sharepoint it's supposed to put it on my local machine, and then upload changes as I make them in the background. It's worked flawlessly for years. Now that this SharePoint is based overseas it becomes a sluggish nightmare from the get-go.

Is there something I can do to stop this behavior? Turning off autosave does not work.