The more data you put into your Excel spreadsheet, the bigger and slower the file will be over time.

Make sure that you can not slightly reduce the size of the inserted images by the number of pixels.
This is very simple under Windows with the on-board tool Microsoft Paint.

In addition, you can reduce graphics that you have inserted as a png or jpeg almost lossless with the online tool Tiny PNG significantly.

Now there are not only obvious graphics and shapes that you can see immediately.

These can also hide in cell comments that only become visible when you move the mouse directly over the cell.

• Replace the graph of the cell comment as follows:
• Right-click on the relevant cell and there “Edit comment”
• Right-click again on the frame of the cell comment and “Format Comment”
• In the next window on “Colors and lines”
• Then the item “Color” on “Fill Effects”
• In the next window, click on “Graphics” and “Select graphic”

If you want graphics to be a cell comment (which of course looks fancy), make sure they are optimized in size.

See picture: (click to enlarge)

Also should be mentioned that such a small bar or pie chart does not inflate the file immediately infinitely.

Finally, we come to a point where you can actually despair, because this is really only to be found with detective work.

It is the so-called “excessive cell formatting” that makes an Excel file incredibly slow, and also takes its toll in size, although it shows absolutely nothing.

This can happen, for example, if you have conditionally formatted cells and have selected an entire column or row instead of just the cells in question.
However, we have already come across this problem, although we have not done anything like that.

You can easily test it by simply selecting the top-most cell (on Windows) in your worksheet and then pressing CTRL + End.

If your cursor lands far away from the actual content somewhere along a line number, there is a suspicion that Excel considers the cells to be filled cells and takes them into account each time they start up, and actively loads them.

Note:
In Excel 2016, the maximum number of lines is 1,048,576 and the maximum number of columns is 16,384.

But fortunately, Microsoft has taken on this problem and offers an add-in for it. Unfortunately, this is not enabled by default and must first be done manually to work with it.

To do this, proceed as follows:

• Go to the tab: “File” on “Options” and “Add-ins”
• In the Manage field, select Com Add-Ins and click Go To
• In the Com Add-Ins dialog box, select the Inquire check box.

From now on you have the additional Inquire tab always available in Excel.

See picture: (click to enlarge)

That was actually the more complicated part of the whole action.

To clean up your spreadsheet of unnecessary cell formatting, under your new “Inquire” tab, click on “Remove excessive cell formatting” and in the next dialog box just select whether you want to perform this action on the current or all worksheets contained in the folder and confirm with “OK”

After saving your file again, you will notice that the file size has shrunk drastically, and your spreadsheet will load as usual in the future.

See picture: (click to enlarge)