I created a spreadsheet a few months ago that graphs three series of data with 90,000 points each. This graph is updated once a minute during normal use. Up until March 5, 2023 updating the graph took a little over a second. I recently opened the same file April 11, 2023 and found that updating the graph now takes over 3 seconds on the same computer. I'm not sure why this would have changed. I noticed that the version of Excel 365 I'm using had been updated. I now have Version 2303 Build 16227.20258. We had another computer here at the office that had not been updated as recently, Version 2302 Build 16130.20332. I tried the file on that machine and it updated as expected, in a little over 1 second. I tried on other computers with 2303 and all were around 3 seconds. The graph is an XY Scatter line graph. Is this Version related or is there something else I might look into to?