First of all, we apologize for the inconvenience caused.
I wonder how many megabytes the size (capacity) of the drawing is and I'm curious about the detailed version of CADian 2024 Pro.
If you use the latest version 7.0.7, you can edit large drawings more smoothly than previous versions when using large drawings.
And if the drawing is over 20MB, it's advisable to split and save the drawing. It's more pleasant to design than editing large drawings.
(Since computer memory has its limits, there may be speed degradation as the drawings get larger.)
If zooming is a bit slow, you can speed it up by entering "vtenable" in the command window and changing it to "0".