Instead of using pictures for logos I usually copy them in Microsoft Paint then PASTESPECIAL in AutoCAD to embed them because we all have received files with missing references for pics.
Anyways I noticed AutoCAD 2019 would keep increasing memory every time a drawing was open and would not release much or any when I closed the drawing and after a publish or opening numerous drawings memory would start to max out. I submitted a performance test and sent them some drawings and come to find out there is a bug in 2019 where it does not release memory with OLE objects. Not sure if just ones created from paint or all, but thought I would give a heads up in case someone ran into the same issue.
To be more specific
OLE entities that are contained in xref’ed drawings aren’t freed up properly