This is a hard one to figure out. The delay, if it is one at all, is minor from what I see. I get delays too as I get more objects or more layers in a stack. But I wouldn't call a 0.25 to 0.5s delay an issue. A 3.0s or 4.0s delay would be a different story.
I think I see a lot of 3rd party plugins installed in your version of Max. Many 3rd party plugins don't undergo the rigorous testing that Max's native plugins do and they often cause issues. For instance, a plugin I love and rely on 'Relink Bitmaps' created an issue where it would take 3-4minutes to even open and it stalled Max while doing so. It was really a disruptive one. The developer spotted it quickly and fixed it with a patch and all is well now. But it could be that one of your 3rd party plugins is injecting some additional calculations that are causing some slight delays.
You could uninstall them one at time and see if the problem goes away. Keep notes so you know which one it was and then reinstall the others. Test to make sure all is well then reinstall the one you identified as the possible problem. See if the problem comes back. If so, then you know which one it is. If not, then maybe it's fixed.
That process will take a lot of time and work but I've gone through it a few times over the years and it's solved oddities in performance that I was pretty sure Max was not causing by default.
Rob Holmes
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3ds Max (2023-2025), V-Ray 6.2, Ryzen 9 3950-X Processor, DDR 4 128MB, Gigabyte Aorus X570 Master motherboard, Sabrent Rocket NVMe 4.0 M.2 drives, NVidia RTX 4090, Space Pilot Pro, Windows 11 Pro x64, Tri-Monitor, Cintiq 13HD, Windows 11 x64
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