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Interesting.  Ticked Accelerate 3D graphics with 1G Graphics memory is even worse than unticked.  I'm using Lenovo T560 i7-6600U @ 2.60ghz, 32Gb ram, SSD, 4K resolution and graphic setting:

2 VMs,  the one with Delphi 2007 installed doesn't have any issue,  but the one with Delphi 10.4/10.3.3 installed is having the issue, never used Snapshot.

Thanks much. It indeed improves, but the scrolling issues I described are still there.

@ A.M. Hoornweg, Thanks.  Are these VM Windows settings or the host's?

Does anyone install 10.3.3/10.4 on a VMWare machine?  I have installed Delphi 10.4 enterprise on a VMWare (15.5.6) machine, Win10 2004, 4K Resolution, 8/10GB Ram (Host has 32GB RAM), having some IDE editor speed issues, mainly related to the mouse wheel scrolling:

1) Open an unit,  went to the end of unit,  Do mouse wheel up/down on the source codes, you would see the source codes scrolling speed is very slow,  took one second to scroll up/down a line.

2) Unchecked "Enable Flow Control Highlighting" from Tools/Options/Editor/Color/Structural Highlighting", then open an unit, do mouse wheel up/down on the source codes, also took one second to scroll up/down a line.