Random Lag When Not Using Excel File

[VBE313]

When I am surfing the web, and my Excel file is in the background, it sometimes lags for a few seconds. I have disabled all add-ins. I know that the lag can be for multiple reasons. I have a UDF in about 30 columns and a bunch of calculations all the way to column NZ. I opened my file as a .zip and here is what I have. Can someone guide me what else to possibly try?

 

[jmacleary]

Maybe you have autorecover on?

 

[VBE313]

Maybe you have autorecover on?

No sir, I am not saving these in the cloud.