The following steps should improve Autocad usage in Softdrive. Please try the following one at a time.
Disable DX12
Type GFXDX12 and set to 0
Disable hardware acceleration
Type 3DConfig and disable hardware acceleration
Set cursortype to default windows
Type CURSORTYPE and set to 1
If the above steps don’t work please try the following
Tooltips - We recommend that you disable ToolTips and rollover ToolTips.
To disable ToolTips and rollover ToolTips:
Click Application menu button > Options.
On the Display tab of the Options dialog box, clear the check marks for Show ToolTips and Show rollover ToolTips.
You can also reset the TOOLTIPS and ROLLOVERTIPS system variable to 0 on the command line.
5) Dynamic Input - We recommend that you disable Dynamic Input.
To disable Dynamic Input:
Right-click the Dynamic Input icon on the Map Status Bar or enter DSETTINGS at the Command prompt.
On the Dynamic Input tab of the Drafting Settings dialog box, clear the check marks for: Enable Pointer Input, Enable Dimension Input where possible, and Show command prompting and command input near the crosshairs.
You can also hide the Dynamic Input icon by right clicking it and clearing the check next to Display > Dynamic Input.
6) Selection Preview -We recommend that you disable Selection Preview when no command is active.
To disable Selection Preview when no command is active:
Click the Application menu button > Options.
On the Selection tab of the Options dialog box, clear the check mark for When no command is active.
You can also reset the SELECTIONPREVIEW system variable to 2 on the command line.
https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/AutoCAD-Performance-Recommendations-for-Citrix-XenApp.html