Illustrator Saving very Slowly, sometimes backwards

[#1]

Ok,

OS Name Microsoft Windows 10 Pro, Version 10.0.18363 Build 18363, Processor Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz, RAM 16.0 GB, NVIDIA Quadro P620 RAM 4.0 GB,  Drives: System SSD, Working on HDD, plenty of space.

So, the problem is that Friday saving in Illustrator worked perfectly fine, updated Windows after working day. Today... saving not only was a slow process, but it was returning to a smaller percentage. Like... from 9 > 15 > 24 > 69% then back to 15%. It even got backwards a few times per saving.

Everyone is waiting for me to finish some mockups. I use some images, linked, pdf compatible off doesn't seem to help too much.

Best regards,

Andrei

[#2]

Ok,

OS Name Microsoft Windows 10 Pro, Version 10.0.18363 Build 18363, Processor Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz, RAM 16.0 GB, NVIDIA Quadro P620 RAM 4.0 GB,  Drives: System SSD, Working on HDD, plenty of space.

So, the problem is that Friday saving in Illustrator worked perfectly fine, updated Windows after working day. Today... saving not only was a slow process, but it was returning to a smaller percentage. Like... from 9 > 15 > 24 > 69% then back to 15%. It even got backwards a few times per saving.

Everyone is waiting for me to finish some mockups. I use some images, linked, pdf compatible off doesn't seem to help too much.

Best regards,

Andrei

[#3]

Is "Save in Background" turned on in the preferences?

How large is the file?

What's in it? Linked files?

Is a printer installed, set up as the default printer and turned on? Printer drivers up to date?