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There is no MMX entry in that Registry. but I still got the error each time starting Delphi.

I think its definitely Delphi IDE issue, you literally have to wait to see the codes scrolling up/down finish then continue coding. Otherwise it works okay. I found so far that can be reproducible: 1. The mouse wheel scrolling issues were only occurred at End/Bottom of every opened unit where you see the empty spaces UNTIL you turn off "Enable Flow Control Highlighting" option, However: 2. Once the option is turned off, then all the units that are opened after are having seriously mouse wheel scrolling lags. 3. When highlight a block of codes, there would be mouse wheel scrolling lags. 4. If an unit has over 10,000+ lines, while you are typing codes, you would literally see the characters being inserted one by one, like typing in one character per second speed. Same VM setting on the same host computer, Delphi 2007 doesn't have any issues at all, but with IDEFixPack (not sure if it could make things differently).

faster system in general, but Delphi IDE is still slow, main tool bar drag& drop lags like hell, mouse wheel scrolling issue still there, I'm not so sure if its due to my older Laptop (4 years old) or not. Since the guest OS is using the host DPI which was set to 125%, and Delphi 10.4 isn't DPI aware, so you would get blurred screens.

I didn't use 3rd party software, just running the guest OS from Hyper-V manager, I guess its the default Windows Remote Desktop??. However, I do see it mentioned that you can't change display settings or DPI from remote access.

Spent some times to convert 2 vmdks to vhdxs, and install Hyper-V. Its a bit faster than VMWare. However, here is the big one I don't like: It automatically scale the virtual machine screen display to match the host DPI, and there is no way you can change it in Guest OS (they are all disabled), I'm always using full screen mode, so its hard to test applications by using different DPIs.

Thank you very much.

OK. will let you know when I have times to try Hyper-V. I can't make smooth Delphi 10.4 IDE on VM. I was starting use Delphi since Turbo Pascal era, can't believe its getting worse after 20 years, tons of bugs.

Yes. I did what you mentioned to the Windows 10 graphics settings, but the scrolling issues were still there.

Thanks much. I will give the Hyper-V a try. is there any tool that could convert a VMWare to a Hyper-V?

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?